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.3D
Three-dimensional object file used in Stereo CAD-3D 2.0, from Antic Software

.3D2
Three-dimensional object file used in Stereo CAD-3D 2.0, from Antic Software

.3D2
Three-dimensional graphics file created in the CyberSculpt, a 3D modeling program for the Atari ST computer

.3D4
Three-dimensional object file used in Stereo CAD-3D 2.0, from Antic Software

.3DM
Three-dimensional object file found in the Rhino 3D modeler application, from McNeel Software

.3DMF
Three-dimensional graphics metafile used in Quickdraw 3D, from Apple

.3DS
Three-dimensional object file used in AutoDesk 3D-Studio and 3D-Studio MAX, from Kinetix / Autodesk

.3DX
Three-dimensional graphics file used in various applications

.8PBS
Native bit map graphics Macintosh file created by Adobe Photoshop

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A

.A
Library file used with the Unix operating system

.A6P
File created by Authorware 6.0, software from Macromedia for developing training programs

.AB
File created in Applix Builder, a developer program from SuSE Linux

.AB3
Album file created in Ulead System's PhotoImpact Album program

.ABC
File used in ABC FlowCharter from Micrografx

.ABF
Adobe Binary Font file, used in Adobe Acrobat, a program that converts documents to Adobe Portable Document Format files (see .PDF)

.ABK
Automatic Backup file, found in CorelDRAW family of graphics applications

.ABK
Backup file created in PrintMaster Gold, a family of drawing applications from Broderbund

.ABL
Script file used in Microsoft Flight Simulator 2002

.ABM
Audio album file created by HitPlayer, a digital recording and playing application from Aztec Radiomedia / Digigram

.ABO
File created in Applix Builder Turbo, a developer program from SuSE Linux

.ABR
Brushed graphics file used with Adobe Photoshop

ABS
Audio Sound file used with MPEG players. MPEG stands for Moving Pictures Experts Group, a committee that sets the compression standard for digital audio and video files.

.ACA
Hypertext transfer protocol (HTTP) file used in Microsoft Agent, a program that enhances applications and Web pages with interactive animated characters

.ACD
Character definition file used in Microsoft Agent, a program that enhances applications and Web pages with interactive animated characters

.ACF
Hypertext transfer protocol (HTTP) character file used in Microsoft Agent, a program that enhances applications and Web pages with interactive animated characters

.ACF
Custom kernel file used with Adobe Photoshop

.ACL
Keyboard accelerator file found in CorelDRAW version 6

.ACM
Audio Compression Manager file found in Microsoft Windows operating systems (Windows 95 and newer)

.ACM
Command buttons file used with Adobe Photoshop

.ACO
Colors file used with Adobe Photoshop

.ACT
Color table used with Adobe Photoshop

.ACV
Curves graphics file used with Adobe Photoshop

.AD
After Dark screen saver file created by Berkeley Systems

.ADN
Add-In file found in the Lotus 1-2-3 spreadsheet program

.ADO
Duotone options file used with Adobe Photoshop

.ADR
File associated with the After Dark Randomizer screensaver, from Berkeley Systems

.ADP
Project file found in Access (Microsoft Office) 2002

.AEP Project file found in ArcExplorer, a family of geographic information system (GIF), or mapping, data viewers from ESRI

.AER
File used in Adobe Atmosphere (2001 release date)

.AF2
File used in ABC FlowCharter 2.0 from Micrografx

.AF3
File used in ABC FlowCharter 3.0 from Micrografx

.AFI
Bit map graphic file format created by Truevision, Inc.

.AHS
Halftone screens file used with Adobe Photoshop

.AI
Vector graphic file associated with Adobe Illustrator (1987 release)

.AIF
Audio Interchange File, a sound format used in Macintosh applications

.AIS
Instrument file found in Velvet Studio, a digital music tracker from Velvet Development

.ALL
Printer information file used with the WordPerfect for Window word-processing program

.ALL
Library file used in graphics applications from Arts & Letters

.ALV
Levels file used with Adobe Photoshop

.AMI
Annotation file found in SolidDesigner, a CAD program from CoCreate

.AMP
Arbitrary map file used with Adobe Photoshop

.AMS
Monitor setup file used with Adobe Photoshop

.AMS
Music module file found in Velvet Studio, a digital music tracker from Velvet Development

.ANI
Animated Cursor file introduced in Microsoft Windows 95 and used in subsequent Windows operating systems

.ANM
Animation file used in the Deluxe Paint program from Electronic Arts

.ANT
Saved game file created by SimAnt, a simulation game from Maxis / Electronic Arts

.APD
Printer driver file used in Lotus 1-2-3

.API
Application Program Interface file found in Adobe Acrobat

.API
Printer driver information filed used in Lotus 1-2-3

.API
Ink colors setup file used with Adobe Photoshop

.APP
Generated Application file used in Microsoft Visual FoxPro database programs

.APR
Project file used with ArcView, a line of mapping and GIS applications from RockWare, Inc.

.ARC
Compressed file created in ARC, an older archiving and compression format

.ARJ
Compressed file that can be opened with the Macintosh-based UnArjMac compression/decompression program and various MS-DOS compression utilities

.ARK
Archive file found in Quark desktop publishing applications

.ART
Clip Art file, found in various applications

.ART
Three-dimensional object file (Another Ray Tracer format) created by Tom Wilson and used in the ART ray tracer for the Unix operating system

.ASC
Text file created using the characters of ASCII(American Standard Code for Information Interchange), a system of computer coding that allows for easy transfer of data between applications. Thus, a variety of programs can read an .ASC file.

.ASD
File used in Astound Presentation

.ASD
Autosave file created by Microsoft's WinWord

.ASE
Sample file found in Velvet Studio, a digital music tracker from Velvet Development

.ASF
Data file found in StatGraphics, a data analysis program from Manugistics

.ASM
Assembly file used in Pro/ENGINEER, a 3D engineering program from PTC

.ASP
Separation setup file used with Adobe Photoshop

.ASP
Active Server Page file used in Microsoft's FrontPage, a Web site creation program

.ASP
File type created and used by the Association of Shareware Professionals, a group of program creators that lets users try an application before purchasing it

.ASR
Scratch area file used with Adobe Photoshop

.AST
Separation tables file used with Adobe Photoshop

.ASV
Selective color file used with Adobe Photoshop

.ATF
Transfer function file used with Adobe Photoshop

.AU
Generic audio file used with various audio applications

.AUX
Auxiliary dictionary file found in ChiWriter, a scientific word processing application from Horstmann Software Development Corp.

.AVI
Audio Video Interleave video format file for use with Microsoft Video for Windows

.AW
Document file associated with Applix Words application

.AW
Answer Wizard file found in Microsoft Works Suite 2002

.AWS
Data file found in StatGraphics, a data analysis program from Manugistics

.AXT
Replace color file or color range file used with Adobe Photoshop

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B

.B
Batch list file used in Applause, data-accessing applications from CUESoft.com

.BAD
Bad, or corrupted, file found in various applications

.BAK
Backup file found in numerous applications, such as the data backup file (data.bak) used in Microsoft programs

.BAS
NetBasic script files found in Novell Netware

.BAS
Source code file for BASIC, a programming language developed in 1963

.BAT
Batch file, which contains a series of commands for a computer's operating system, in DOS (disk operating system)

.BBM
Brush Bitmap image file in the Deluxe Paint application from Electronic Arts

.BBS
Text file used on a Bulletin Board System, an Internet-based electronic messaging center

.BCF
1-2-3 data configuration file used in Lotus SmartSuite

.BCM
Communications file found in Microsoft Works

.BDB
Database file found in Microsoft Works

.BDF
File generated by West Point Bridge Designer, a public domain, educational software written by Stephen Ressler

.BDR
Border file in Microsoft Publisher

.BEZ
Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application

.BFC
Briefcase document file found in Microsoft Windows operating systems

.BFF
Three-dimensional object file (binary) found in the WorldTookKit graphics program, from Sense8

.BFX
Fax document file for Bitfax Professional, from Cheyenne Software

.BG
Saved game file created in Microsoft's Backgammon gaming application

.BGL
Scenery file found in Microsoft's Flight Simulator gaming application

.BGL
Scenery file found in Microsoft Flight Simulator 2002

.BI (also .BIN)
Binary file. Binary is a numbering scheme in which there are only two digits: 0 and 1. A binary file contains information stored only in this format.

.BIF
Initialization file used in GroupWise, a family of e-mail and collaboration applications from Novell

.BIFF
Binary Interchange File Format, which stores data for the Microsoft Excel spreadsheet application

.BIN
see .BI

.BIO
BIOS (basic input/output system) file used in IBM's OS/2 operating system

.BIZ
Three-dimensional object file created in dVS, from Division Ltd.

.BK!
Document backup file in Corel WordPerfect for Windows applications

.BK
Faxbook file associated with JetFax

.BKS
Backup file used in Microsoft Works Spreadsheet

.BLK
Temporary file found in Corel WordPerfect for Windows applications

.BLP
User information (personal data) file created in Broderbund Business Lawyer

.BM
Bit-mapped file found in Microsoft Windows operating systems

.BMF
Image file used in Corel GALLERY family of image software

.BMK
Help Bookmark file used in Microsoft Windows 3.X

.BMP
Bit-mapped graphics file for Windows or OS/2 operating systems, found in such applications as CorelDRAW. A bit map is a type of graphics file in which bits (binary digits) represent tiny squares of the image's colors.

.BND
Multimedia file associated with the Microsoft Resource Interchange File Format (similar to .AVI and .WAV files)

.BNK
Instrument bank file used in AdLib, an archive and records management application

.BNK
Sound effects bank file used in Electronic Arts applications

.BOOK
File developed in the Adobe FrameMaker Book program

.BOX
File associated with Lotus Notes applications

.BPOLY
Three-dimensional object file (binary format) used in the PRISMS database application, from Side Effects Software

.BPS
Microsoft Works document file

.BPT
Bit map fills file for CorelDRAW family of graphics applications

.BPX
Targa bit map graphics file created by Truevision, Inc.

.BRF
Briefing file used in Microsoft Flight Simulator 2002

.BRL
File created in Beautiful Report Language, a dialect of the Scheme programming language

.BRL
Three-dimensional object file found in the BRL-CAD program, from the Ballistic Research Laboratory of the U.S. Army

.BSC
Compressed archive file used with Apple II

.BSP
Map file created for id Software's Quake gaming application

.BTM
Batch file used in Norton Utilities programs (see .BAT)

.BTR
Database file found in Btrieve, a family of data management applications from Pervasis Software

.BUN
Bundled audio and MIDI files found in all Cakewalk programs, which are computer-based recording applications

.BUP
Backup file used in a wide variety of applications

.BYU
A three-dimensional object file used in the Movie BYU application, created at Brigham Young University

.BZ2
Compressed file created by bzip2 (version 1.0.1 and earlier), a data compression application

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C

.C3D
Project file generated in Ulead System's COOL 3D program (versions 3.0 and 3.5)

.C3V
EnVector module project file found in Ulead System's COOL 3D program (version 3.5)

.CAC
Executable file used in dBASE IV, a database application from dBASE Inc.

.CAL
Schedule data file used with Microsoft Windows 3.x Calendar

.CAL
Spreadsheet file used in SuperCalc, a scientific calculator program written in Java

.CAP
Session capture file used with Telix for Windows, an online communications program from deltaComm. Development.

.CAP
Caption file used in Corel VENTURA Publisher (8.0 and previous)

.CAT
Intellicharge categorization file found in Intuit's Quicken financial software

.CAT
Catalog file used in database applications from dBase Inc.

.CBC
Fuzzy logic system file used in CubiCalc from HyperLogic. Fuzzy logic is used in applications such as database and searching programs where answers can fall within a range of possibilities.

.CBL (also .COB)
COBAL source code file. COBAL stands for Common Business-Oriented Language, a programming language created in the 1950s and 1960s for business applications.

.CBT
Computer Based Training file. CBT is a generic training program that uses computers to teach skills.

.CC
Custom class file found in Visual dBASE, a database program from dBASE, Inc.

.CC
Source code file used with the C++ programming language

.CCC
Native bit-mapped graphics file used in Curtain Call, presentation software from Zuma Group

.CCE
Data file created in Calendar Creator Plus from The Learning Co.

.CCH
Chart file created in Corel Chart

.CDF
Three-dimensional object file (Cyberspace Description Format), created by Autodesk

.CDM
Conceptual data model file created in PowerDesigner, a line of database design applications from Sybase Inc.

.CDM
Custom data module file found in Visual dBASE, a database program from dBASE, Inc.

.CDT
Template file in CorelDRAW family of graphics applications

.CDB
Database file used in CardScan, a family of business and scanning applications from Corex Technologies

.CDR
Document created in the CorelDRAW family of graphics applications

.CDX
Compressed drawing file created in the CorelDRAW family of graphics applications

.CDX
Index file found in the Microsoft Visual FoxPro database program

.CEL
Still picture file found in the Animator application, from AutoDesk

.CFG
Configuration file found in various applications. A configuration file establishes the user's choices for the way a computer's hardware and software are set up, or configured.

.CFL
Chart file created in CorelFLOW

.CFM
File associated with ColdFusion 5.0, from Macromedia

.CFM
Customer form file used in Visual dBASE, a database program from dBASE, Inc.

.CGI
Common gateway interface script file. CGI script is a program written with a scripting language, such as Java, that dictates the way information is exchanged between a server and an application using HTTP (Hypertext Transfer Protocol) on the Web.

.CGM
Computer (sometimes compressed) graphics metafile created in many applications, including Microsoft Visio 2002. A .CGM is a standard vector graphics file.

.CH3
Chart file used in Harvard Graphics Chart XL 3.0

.CHI
File created in ChiWriter, a scientific word processing application from Horstmann Software Development Corp.

.CHK
Temporary file in Corel WordPerfect for Windows

.CHL
Configuration history log found in various applications. See .CFG.

.CHP
Chapter file found in Corel VENTURA Publisher (8.0 and previous)

.CHT
File created in ChartViewer, from Golden Gate Software

.CLP
Clipboard file, first used for the Clipboard application in Microsoft's Windows 3.0

.CIL
Clip gallery download package file found in Microsoft Works Suite 2002

.CIM
Saved game file in Sim City 2000, a simulation game from Maxis/Electronic Arts.

.CLP
Clip-art file used in Corel Quattro Pro

.CMD
Command file used in Microsoft Windows NT and IBM's OS/2 operating systems

.CMG
Saved game file in Chessmaster, from The Learning Co.

.CMR
Movie file associated with Microsoft Windows Media Player

.CNV
Temporary file used in Corel WordPerfect for Windows

.COB
see .CBL

.COB
Object file used in trueSpace2, from Calgari

.COL
Color palette file found in the Animator application, from AutoDesk

.CPF
Fax file used in The Complete Fax , from Black Ice Software

.CPT
Compressed archive created in the Apple Macintosh operating system

.CRC
Circular reference file used in Pro/ENGINEER, a 3D engineering program from PTC

.CRD
File associated with the Cardfile application introduced in Microsoft's Windows 3.0

.CRF
Cross reference file found in the Zortech C++ programming language, from Zortech Inc.

.CRP
Custom report file created in Visual dBASE, a database program from dBASE, Inc.

.CSC
Script file in various Corel applications. Similar to a macro or batch file, a script file is a list of commands performed by the computer.

.CTF
Catalog file developed by MGI to store thumbnail-size images

.CTX
Ciphertext file used with Pretty Good Privacy, a freely distributed encryption application

.CUE
Script file used in Web servers for Applause (CUESoft) applications

.CUE
Cue Cards data file found in Microsoft Works for Windows 3.0

.CUR
Cursor file for Microsoft Windows operating systems

.CVS
Drawing file used in Canvas, an image-editing application from Deneba

.CWB
Bundle file found in Cakewalk's SONAR 1.3

.CWC
Chord library file found in Cakewalk's SONAR 1.3

.CWL
Layout file found in Cakewalk's SONAR 1.3

.CWP
Project file found in Cakewalk's SONAR 1.3

.CWS
Template file used in Claris Works (now AppleWorks)

.CWT
Template file found in Cakewalk's SONAR 1.3

.CWK
Data file found in Claris Works (now AppleWorks)

.CY
Three-dimensional object file found in the Echo scanning program, from Cyberware

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D

.DAO
Registry Backup file for Microsoft Windows operating systems

.DAP
Data access page file found in Microsoft Access 2000

.DAT
Merge data file used in Corel WordPerfect for Windows applications

.DAT
Data file used in various applications

.DB
Table database file found in Paradox 7 from Broderbund

.DB_BTREE
A database file supported by Berkeley DB, a C-based interface for a number of database formats.

.DB_HASH
A database file supported by Berkeley DB, a C-based interface for a number of database formats.

.DBC
Database container file used in Visual FoxPro database applications from Microsoft

.DBF
Tablespace file used in Oracle 8.1.x, a database program from Oracle.

.DBF
Database file found in database programs such as dBase, Clipper, and FoxPro

.DBK
Database backup file used in dBASE, an interactive database application from dBASE.

.DBK
Backup file created in OrCAD Schematic Capture, from Cadence Design Systems, Inc.

.DBM
Data file used in DataEase accounting programs

.DBO
Compiled program file found in dBASE IV

.DB_RECNO
A database file supported by Berkeley DB, a C-based interface for a number of database formats.

.DBT
Text memo file used in dBASE, an interactive database application from dBASE.

.DBV
Memo field file used in FlexFile 2, a memo / data storage program

.DBX
Table file used in Visual FoxPro database applications from Microsoft

.DC
CAD (computer-aided design) file used in DesignCAD, a high-end design application

.DC2
CAD (computer-aided design) file used in DesignCAD, a high-end design application

.DC5
Drawing file created in DataCAD 5, a business-to-business architecture application from DataCAD LLC.

.DCA
Document content architecture text file created in IBM's DisplayWrite

.DCF
File used in Harvard Graphics Chart XL 3.0

.DCR
Published Shockwave movie file in Director Shockwave Studio 8.5, from Macromedia

.DCS
Bit map graphics file associated with Quark XPress

.DCT
Database container file found in Visual FoxPro database applications from Microsoft

.DCT
Dictionary database file found in various programs, including Clarion Database Developer

.DCX
Database container file found in Visual FoxPro database applications from Microsoft

.DD
Compressed archive file created by Norton DISKDOUBLER from Symantec

.DDF
Data definition file found in Btrieve, a family of data management applications from Pervasis Software

.DDI
Image file used in DiskDupe, a disk copying program from Micro Systems Designs

.DDK
Single legal document file, found in a Broderbund legal application, when an individual legal document needs to be modified because of a legislative change. A user will find this file in his system if he has downloaded it as part of a legal update.

.DEF
Data file used in SmartWare II, a word-processing application for DOS computers

.DEF
Definition file used with the C++ programming language, from Borland

.DEFI
Deinstallation script file used in Oracle 7, a database program from Oracle.

.DEM
Three-dimensional object file, created in the Digital Elevation Model format, from the U.S. Geological Survey

.DEV (also .DRV)
Device driver file, found in various programs. A driver enables a hardware peripheral (the device, such as a printer) to communicate with a computer.

.DEZ
Encrypted compressed file made with programs from the DES Encryption Software Group

.DFD
Data flow diagram graphics file found in applications from Prosa, an Italian freeware developer

.DFM
Data flow diagram model file found in applications from Prosa, an Italian freeware developer

.DGN
Graphics/drawing file created in MicroStation, from Bentley Systems, or Microsoft Visio 2002

.DHH
Single legal document file containing the document's description and associated help information, found in Broderbund legal applications.

.DIC
Dictionary file found in such applications as Lotus Notes and Microsoft WinWord

.DIB
Device-independent bit map file found in Microsoft Windows; can be created in various applications, including Microsoft Visio 2002

.DIF
Database file used in VisiCalc, an early spreadsheet application from Software Arts.

.DIG
File used with the ISP DigiLink Internet Services

.DIG
Audio file found in Sound Designer I, a digital music application

.DIR
Dialing directory file found in the ProComm Plus terminal emulation applications from Symantec

.DIR
Movie file created in MacroMind Director 4.X from MacroMind (Macromedia)

.DIR
Native files used in Director Shockwave Studio 8.5, from Macromedia

.DIS
Thesaurus file used in CorelDRAW graphic applications

.DKB
Three-dimensional object file found in the DKB-Trace ray tracer

.DLD
Data file used in Lotus 1-2-3

.DLG Dialogue script file used in the C++ programming language from Borland

.DLL Export/import filter file used in CorelDRAW graphics applications

.DLL
Dynamic-link library file. These files, commonly found in Windows and OS/2, are loaded into memory only when the programs they are associated with are running.

.DLS
Setup file for the Norton DiskLock program

.DMD
Data module file found in Visual dBASE, a database application from dBASE.

.DMF
Music module (MOD) file used with the X-Trakker digital music application

.DMP
Dump file, which contains data from a computer's memory when a program is prematurely terminated

.DOB
User document found in Microsoft Visual Basic, development software for business applications

.DOC
Document created in DisplayWrite, a family of word-processing applications from IBM

.DOC
Document and text files created in word processing applications, including Microsoft Word and Corel WordPerfect

.DOCHTML
Word HTML (Hypertext Markup Language) file found in Microsoft Works Suite 2002

.DOCMHTML
Word HTML (Hypertext Markup Language) file found in Microsoft Works Suite 2002

.DOS
A text file generated in the disk operating system

.DOT
Document template file used in Microsoft Word

.DOT
Line-type definition file found in CorelDRAW graphics applications

.DOTHTML
Word HTML (Hypertext Markup Language) template file found in Microsoft Works Suite 2002

.DOX
User document binary form file found in Microsoft Visual Basic, development software for business applications

.DOX
Text file created in MultiMate for Windows 4.X

.DPR
Project header file found in the C++ programming language from Borland

.DPT
Publication file created in Publish-It!

.DRC
Design rules check report file found in OrCAD Schematic Capture, from Cadence Design Systems, Inc.

.DRS
Display resource file found in Microsoft WordPerfect for Windows applications

.DRV
Device Driver file (see .DEV)

.DRW
Drawing file created in Pro/ENGINEER, a 3D engineering program from PTC

.DRW
Graphics file used in iGrafx Business and Micrografx Windows Draw

.DS4
Vector graphics file used in Micrografx Designer 4

.DSC
Discard file found in Oracle database applications

.DSD
Database file used in DataShaper from Data Shaping Solutions

.DSF
File found in iGrafx Designer and Micrografx Designer, both vector graphics programs from Micrografx

.DSG
Saved game file in DOOM

.DSK
Disk NLM (Netware loadable module) files for Novell Netware

.DSN
Schematic file created in OrCAD Schematic Capture, from Cadence Design Systems, Inc.

.DSR
Designer file used in Microsoft Visual Basic, development software for business applications

.DSR
Driver resource file found in Microsoft WordPerfect for Windows

.DSS
Digital sound file from Digital Soup

.DSW
Desktop settings file found in the C++ programming language (version 4.5) from Borland

.DSW
Workspace file used in Microsoft Developer Studio

.DSX
Designer binary file used in Microsoft Visual Basic, development software for business applications

.DTA
Data file used with the Turbo C++ programming language, from Borland

.DTM
Module file used with DigiTrakker, a digital music application

.DTP
Text document in Timeworks Publisher 3.X

.DTP
Template file found in Pressworks from GST Software Publishing

.DTP
Publication file in Microsoft's Publish It! application

.DVC
Data file used in Lotus 1-2-3

.DVP
Digital Video Project file found in Ulead System's MediaStudio Pro (versions 5.2, 6.0, and 6.5)

.DVP
Device parameter file found in AutoCAD, general design software from Autodesk

.DW2
Drawing file used in DesignCAD for Windows

.DWB
Three-dimensional object file (binary) found in Designer's Workbench, Easy T, and EasyScene, modeling programs from Coryphaeus Software

.DWBA
Three-dimensional object file (ASCII) found in Designer's Workbench, Easy T, and EasyScene, modeling programs from Coryphaeus Software

.DWC
Compressed archive file created with the DWC compression utility

.DWD
Digitized file used in DiamondWare, a family of real-time, interactive audio applications

.DWF
Vector graphics file found in Autodesk applications

.DWF
Internet file used with AutoCAD, general design software from Autodesk

.DWG
AutoCAD drawing file; can be created in AutoCAD or Microsoft Visio 2002

.DWT
File created by Dreamweaver 4.0, an HTML page production application from Macromedia

.DWZ
DVD project file found in Ulead System's DVD MovieFactory application

.DXF
AutoCAD interchange file; can be created in such applications as AutoCAD, 3D Home Architect (Broderbund), and Microsoft Visio 2002

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E

.EBJ
Error checking object file used with Geoworks, a mobile Internet application

.EBO
File used in Microsoft Reader

.ED
Graphics file created in EasyDraw, a Japanese CAD application

.ED5
Image file found in EDMICS, the Engineering Data Management Information and Control System for automating storage, reproduction, and distribution of drawing files

.ED6
Image file found in EDMICS, the Engineering Data Management Information and Control System for automating storage, reproduction, and distribution of drawing files

.EDA
ASR disk image file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EDB
Word Pro border graphics file used in Lotus SmartSuite

.EDB
Data file created in Roots3, a genealogical (family tree) program, from Comsoft, Inc.

.EDE
EPS disk image found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EDK
KT disk image found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EDQ
SQ1, SQ2, and KS32 disk image found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EDS
SQ80 disk image found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EDT
Default settings file in VAX EDT, an Open VMS editing application from Boston Business Computing

.EDV
VFX-SD disk image found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EFA ASR file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EFE
EPS file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EFK
KT file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EFQ
SQ1, SQ2, and KS32 file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EFS
SQ80 file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EFT
High-resolution screen font found in ChiWriter, a scientific word-processing application from Horstmann Software Development Corp.

.EFV
VFX-SD file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EFX
Fax document file in EFax applications

.EGA
EGA display font used in Corel VENTURA Publisher applications

.EL
Lisp source code found in Emacs Lisp (or Elisp), the language used with the Emacs text editor

.ELM
Theme-Pack file used in Microsoft FrontPage

.ELT
Event list text file associated with applications from Prosa, an Italian freeware developer

.EMF
Enhanced metafile created in Microsoft Windows and Visio 2002 applications

.EML
Mail file created in Entourage 2001, part of Microsoft Office 2001 for the Mac

.EML
E-mail message file used with Microsoft Outlook Express

.EMZ
Compressed enhanced metafile created in Microsoft Windows and Visio 2002 applications

.ENC
File used in Encore, a music notation program developed by Passport Design Systems and now owed by GVOX

.ENC
Encoded file found in Lotus 1-2-3 spreadsheet applications

.END
Arrow-Head definition table file used in CorelDRAW graphics applications

.ENFF
Three-dimensional object file (Extended Neutral File Format) created by Eric Haines and used in various applications, including the Standard Procedural Database and free ray tracers

.ENG
EnerGraphics Chart graphics file

.EPS
Encapsulated PostScript graphics file, found in graphics programs such as CorelDRAW and VENTURA Publisher, Aldus PhotoStyler, and Adobe Illustrator

.EPS
Printer font file associated with Epson and Xerox printers

.EPS2
Encapsulated PostScript graphics file found in Adobe Level II applications

.EPSF
Encapsulated PostScript graphics file, found in graphics programs such as CorelDRAW and VENTURA Publisher, PhotoStyler, and Adobe Illustrator

.EPSI
Encapsulated PostScript Interchange file used in Adobe applications

.ERR
Generic error message file generated by a program's Help system

.ERD
Entity Relationship Diagram graphics file used in applications from Prosa, an Italian freeware developer

.ERM
Entity Relationship Diagram Model file used in applications from Prosa, an Italian freeware developer

.ERR
Compilation error file found in Visual FoxPro database applications from Microsoft

.ESL
Distributable support library file found in Visual FoxPro database applications from Microsoft

.EST
Streets & Trips map file found in Microsoft Works Suite 2002

.ETH
Document file found in Ethnograph (version 5.0 and previous), a qualitative data analysis program from Qualis Research

.EUI
EPS compacted disk image file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.EVT
Event log file found in Windows NT and Windows 2000. An "event" is an action that occurs within a PC's hardware or software.

.EWD
Express Publisher for Windows text document file

.EWL
Document found in Microsoft Encarta reference software

.EXC
Microsoft Word Exclusion dictionary file

.EXE
Executable file run with applications on DOS computers. An executable file is a format that a computer can execute without the assistance of the user.

.EXP
Saved chat file on the ICQ network, an online instant messaging program

.EZP
Compressed file created by the Edify Electronic Workforce Backup Utility compression program

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F

.F
Compressed archive file found in the Unix operating system

.F
FORTRAN (formula translator) file. FORTRAN is a computer programming language designed by IBM in the 1950s.

.FAFF
File found in the Fast Advantage database program

.FAQ
Frequently asked questions text file found in various applications

.FAR
Music module file found in Farandole Composer

.FAS
Basic module file used in 3-D Fassade Plus

.FAV
Navigation bar file used in the Microsoft Outlook e-mail application

.FBC
Compressed backup file used with FamilyTree Maker, from The Learning Co.

.FBK
Backup file in Navision Financials, a business management application from Navision Software

.FBK
Backup file used with FamilyTree Maker, from The Learning Co.

.FCD
File found in FastCAD, from Evolution Computing

.FD
Field offsets for compiler file found in DataFlex, a Data Access program for developing database applications

.FDB
Database file found in Navision Financials, a business management application from Navision Software

.FDF
Forms document file used with Adobe Acrobat, a program that converts documents to Adobe Portable Document Format files

.FFA
File used in Microsoft's FastFind application

.FFA
File associated with the Find Fast utility in the Microsoft Office suite

.FFIVW
A proposed VRML file format developed by Bernie Roehl and Kerry Bonin. VRML is a platform-independent language used to create virtual reality scene design.

.FFL
File associated with the Find Fast utility in the Microsoft Office suite

.FFL
Image file associated with PrintMaster Gold, an image library program from The Learning Co.

.FFX
File associated with the Find Fast utility in the Microsoft Office suite

.FH3
Vector graphics file used in the Aldus Freehand drawing program (version 3.0)

.FH4
Vector graphics file used in the Aldus Freehand drawing program (version 4.0)

.FHS
Three-dimensional object file found in in-house virtual reality software Fraunhofer Gesellschaft, a German company

.FI
File interface file found in FORTRAN (formula translator), a computer programming language designed by IBM in the 1950s

.FIG
Three-dimensional object file (FIGure format) found in the REND386, VR386, AVRIL and Gossamer graphics applications

.FIL
Files list object file used in dBASE Application Generator, from dBASE

.FIT
File index table file associated with the Microsoft Windows NT operating system

.FIF
Fractal image graphics format file used in various applications

.FIX
A generic patch, or fix, file added to a program to correct a flaw.

.FKY
Macro file found in Visual FoxPro database applications from Microsoft

.FLA
File used in Flash 5.0, an animated Web content developer application from Macromedia

.FLB
Format library file found in Papyrus, a bibliography-making application from Research Software Design

.FLC
Animation file used in Autodesk design applications

.FLF
License file used in Navision Financials, a business management application from Navision Software

.FLF
Driver file created for IBM's OS/2 operating system

.FLI
Animation file used in Autodesk design applications

.FLL
Distributable dynamic link library file used in Visual FoxPro database applications from Microsoft

.FLM
File roll file found in AutoCAD, general design software from Autodesk

.FLP
User information (personal data) file created in Family Lawyer, from Broderbund

.FLT
Filter file used in various applications, including those from Corel and Micrografx

.FLT
Graphics filter support file used in Aymetrix ToolBook for Microsoft Windows, a content authoring application from Click2learn

.FLT
Graphics filter file used in various Microsoft programs

.FLT
Saved flight file created in Microsoft Flight Simulator 2002

.FLT
Music module (MOD) file used with the StarTrekker digital music program

.FLT
A three-dimensional object file (OpenFlight Format) found in the MultiGen and ModelGen programs, from Multigen

.FLX
Compiled binary file found in DataFlex, a Data Access Corp. program for developing database applications

.FM
File used in Adobe FrameMaker (1995 release)

.FM1
Spreadsheet file used in Lotus 1-2-3, Version 2.X

.FM3
Spreadsheet file used in Lotus 1-2-3, Version 2.X

.FMK
Make file used in FORTRAN PowerStation, a line of compiler applications from Microsoft

.FMO
Compile format file used in dBASE IV, a database application from dBASE

.FMT Print file found in Microsoft Schedule+, a scheduling application introduced with Windows 95

.FNK
Module file in FunkTracker, a sound file editor application used with the Linux operating system

.FO1
Font file found in the Borland Turbo C programming language

.FO2
Font file found in Borland Turbo C programming language

.FON
Bit-mapped font file used in Microsoft Windows operating systems

.FON
Call log file used in the ProComm Plus terminal emulation applications from Symantec

.FON
Dialing directory file found in Telix, an online communications program from deltaComm Development, Inc.

.FOR
Source code file used with the FORTAN programming language, designed by IBM in the 1950s

.FP
Configuration file used in Visual FoxPro database applications from Microsoft

.FP3
Database file generated by FileMaker (versions 3.0 through 4.1)

.FP3
Document file used in FileMaker Pro (versions 3.0–4.0), from FileMaker

.FP3
File created in Floor Plan (version 3.0), from IMSI, an Australian software company

.FP5
Document file used in FileMaker Pro (version 5.0), from FileMaker

.FP5
Database file generated by FileMaker 5.0

.FPC
Catalog file used in Visual FoxPro database applications from Microsoft

.FPC
Catalog file used in Microsoft Visual FoxPro applications

.FPT
File associated with FileMaker Pro, from FileMaker

.FPT
Memo field tables file used in Visual FoxPro database applications from Microsoft

.FPW
Floorplan drawing file created in FloorPlan Plus for Windows, a home and office design package from IMSI, an Australian software company

.FPX
FlashPix format for storing digital images and photographs, developed by Eastman Kodak in 1996

.FRG
Uncompiled report file used in dBASE IV, a database application from dBASE

.FRM
Form file used in Microsoft Visual Basic, development software for business applications

.FRM
Symbol report file used in DataCAD, a business-to-business architecture application from DataCAD LLC

.FRM
Document created in Adobe FrameMaker

.FRO
Compile report file used in dBASE IV, a database application from dBASE

.FRT
Report menu file found in Visual FoxPro database applications from Microsoft

.FRX
Form stash file found in Microsoft Visual Basic, development software for business applications

.FRX
Report file used in Microsoft Visual FoxPro applications

.FSL
Saved form file found in the Corel Paradox family of relational database applications

.FSM
Wave sample file used in Farandole Composer

.FST
Linkable program file used in CA-dBFast, a Windows-based application development system from Computer Associates

.FSX
Data file used in the Lotus 1-2-3 spreadsheet applications

.FSX
Data file used in the Lotus 1-2-3 spreadsheet program

.FT
Full Text index file used in Lotus Notes

.FTB
Index file used in Roots3, a genealogical (family tree) program, from ComSoft, Inc.

.FTP
File Transfer Protocol file. FTP is a method of sending and receiving files between computers, especially on the Internet.

.FTW
Document file created by FamilyTree Maker, from The Learning Co.

.FW
Database file found in Framework, from Selections & Functions

.FW2
Database file found in Framework II, from Selections & Functions

.FW3
Database file found in Framework III, from Selections & Functions

.FW4
Database file found in Framework IV, from Selections & Functions

.FWB
Backup data file used in FileWrangler, a file management application from CursorArts

.FWS
Data file associated with file splitting configuration in FileWrangler, a file management application from CursorArts

.FX
Graphic effects file used in Microsoft Flight Simulator 200

.FXP
Compiled source code file used in Microsoft Visual FoxPro database applications

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G

.GAM
Fax document file used in GammaFax applications from SpaceTec

.GAU
Aircraft gauge files found in Microsoft Flight Simulator 2002

.GC1
LISP source code file found in Golden Common LISP 1.1, training and development software from Gold Hill (see .L for more information on LISP)

.GC3
LISP source code file found in Golden Common LISP 1.3, training and development software from Gold Hill

.GDB
Database file found in InterBase, from Borland

.GDF
Dictionary file used in GEOS, an operating system from GeoWorks

.GED
GEDCOM genealogical application database file

.GED
Graphics editor file used in applications from Arts & Letters

.GEM
Vector graphics file used in Corel VENTURA Publisher applications

.GEN
Compiled template file found in dBASE Application Generator, dBASE

.GEN
Generated text file used in Corel VENTURA Publisher

.GEO
VRML (Virtual Reality Modeling Language) Support file used with TurboCAD, a line of computer-aided design products from IMSI. VRML is a platform-independent language used to create virtual reality scene design.

.GDS
A three-dimensional object file used in CAD applications from McDonnell-Douglas

.GEOM
Three-dimensional object file found in the Application Visualization System application, from Advanced Visual Systems, Inc.

.GFB
GIFBlast compressed GIF image file, a freeware program for Macintosh computers

.GFI
Graphics link presentation file in Genigraphics applications, which are bundled with Microsoft PowerPoint presentation software

.GFO
A three-dimensional object file, created by Silicon Graphics, found in the IRIS Performer database application

.GFT
Font file found in NeoPaint for Windows, an image-editing program from NeoSoft Corp.

.GFX
Graphics link presentation file used in Genigraphics applications, which are bundled with Microsoft PowerPoint presentation software

.GIB
Chart file found in Graph-in-the-Box, from Echoscan

.GID
Index file used in Microsoft Windows Help tools

.GID
Global index file used in Microsoft Windows 95 operating system

.GIF
Graphics Interchange Format file. Used first by CompuServe, GIF is a compression format that compresses and transfers graphic images into digital information. Files with the .GIF extension are bit-mapped (see .BMP).

.GIM
Graphics link presentation file used in Genigraphics applications, which are bundled with Microsoft PowerPoint presentation software

.GIW
Graph-in-the Box for Microsoft Windows presentation file

.GIX
Graphics link presentation file used in Genigraphics applications, which are bundled with Microsoft PowerPoint presentation software

.GKH
EPS family disk image file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.GKS
Two-dimensional or three-dimensional graphics file created in the Graphics Kernel System format; similar to Computer Graphics Metafile format

.GLM
Data file used in GLIM (Generalized Linear Interactive Modeling), statistical software from NAG

.GLY
Glossary file found in Microsoft WinWord

.GMF
CGM graphics file used in Applause, data-accessing applications from CUESoft.com

.GNA
Graphics link presentation file used in Genigraphics applications, which are bundled with Microsoft PowerPoint presentation software

.GNX
Graphics link presentation file used in Genigraphics applications, which are bundled with Microsoft PowerPoint presentation software

.GPH
Graph file used in Lotus 1-2-3

.GR2
Screen driver file used in Microsoft Windows 3.X operating system

.GRA
Graph chart file created in Microsoft Works Suite 2002

.GRA
Data file used in SigmaPlot, a graphing application from SPSS Science

.GRF
Graph file found in Charisma Graph Plus, from Micrografx

.GRP
Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application

.GSP
File associated with The Geometer's Sketchpad, a mathematics application from Key Curriculum Press

.GS1
Presentation file created in GraphShow 1.0, a Java-based animation application

.GSW
Worksheet file created in GraphShow 1.0, a Java-based animation application

.GZ
Compressed file generated by GZIP, a freeware compression application

.GWX
Graphics link presentation file used in Genigraphics applications, which are bundled with Microsoft PowerPoint presentation software

.GWZ
Graphics link presentation file used in Genigraphics applications, which are bundled with Microsoft PowerPoint presentation software

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H

.H++
Header file created in the Borland C++ programming language

.H Program header file used with the C programming language

.HAL
Hyper Access Lite data file, developed for the OS/2 operating system

.HAM
Novel Netware loadable module file

.HBK Handbook file found in Mathcad, a technical calculation program from Math Soft Engineering and Education

.HDA
Document file used in Hot Docs, automation software from Capsoft Development

.HDL
Alternate download listing file found in ProComm Plus terminal emulation applications from Symantec

.HDR
Message header text file used in ProComm Plus terminal emulation applications from Symantec

.HDX
Help index file found in AutoCAD, general design software from Autodesk

.HDX
Help index file found in the Zortech C++ programming language from Zortech

.HED
Document file used in HighEdit, an application for software developers produced by Pinnacle Publishing

.HEL
Saved game file in Microsoft Hellbender

.HFX
Voice data file associated with US Robotics Rapid Comm modems

.HGL
Hewlett-Packard Graphics Language drawing file

.HH
Header file associated with the Borland C++ programming language

.HHP
Help information file for remote users found in ProComm Plus terminal emulation applications from Symantec<

.HIT
Audio file associated with HitPlayer, a networked audio system from Digigram

.HLP
Help file, found in a variety of applications

.HMM
Mail read option menu file in ProComm Plus terminal emulation applications from Symantec

.HPG
HPGL plotter vector graphics file used in AutoCAD, general design software from Autodesk

.HPK
Compressed archive file generated by HPACK, a multi-system archive application

.HPM
Privileged members menu file found in ProComm Plus terminal emulation applications from Symantec

.HPP
Program header file created in the Borland C++ programming language

.HPP
Header file created in the Zortech C++ programming language

.HQX
Compressed BinHex (a Macintosh encoding format) file

.HRM
Limited users menu file found in ProComm Plus terminal emulation applications from Symantec

.HSI
Graphics file found in applications from Handmade Software, Inc., including Image Alchemy

.HSS

Hue saturation file used with Adobe Photoshop

.HST
History file, used in a variety of software, including ProComm Plus

.HTM
File used in HomeSite, an HTML editor program from Macromedia

.HTML (also .HTM)
Hypertext Markup Language file. HTML is the language used to design content for the World Wide Web. Thus, .HTML files are mostly associated with Web pages.

.HXM
Protocol selection menu found in ProComm Plus terminal emulation applications from Symantec

.HXX
Header file created in the Borland C++ programming language

.HYC
Hyphenation file used in Corel WordPerfect for Windows applications

.HYD
Hyphenation Dictionary file used in Corel WordPerfect for Windows applications

.HYP
Hypertext file (various applications), in which elements are connected to one another via active links

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I

.I
Intermediate file created in the Borland C++ programming language

.IAN
Text file found in GroundWorks COOL BizTeam, a data modeling tool from Sterling Software

.ICA
Graphics file based on the IOCA(Image Object Content Architecture) standard

.ICC
Printer image file used in Kodak applications

.ICC
Catalog file used in IronClad, security software for networks

.ICD
Drawing file used in IronClad, security software for networks

.ICL
Icon library file found in various applications

.ICM
Image color matching profile, which is used by a color management system to reproduce images from source device to target devices; found in various applications and operating systems, including Microsoft Windows

.ICO
Icon file used in Microsoft Windows 3.x operating system

.ICS
Scene file used in IronClad, security software for networks

.ICS
Calendar file used in Microsoft Outlook e-mail program

.IDB
Intermediate file used in Microsoft Office Developer Edition

.IDD
Instrument definition file, based on the MIDI (musical instrument digital interface) protocol for transforming musical sounds into digital form

.IDE
Project file created in the Borland C++ programming language (version 4.5)

.IDF
Instrument Drivers file, based on the Musical Instrument Digital Interface protocol, used in Microsoft Windows operating systems' configuration files

.IDIF
Identification file associated with the address book in Netscape Mail

.IDW
Vector graphics file used in IntelliDraw

.IDX
Relational database index file created in the Q&A applications from Symantec

.IDX
Index file found in Microsoft Outlook Express

.IDX
Index file found in various applications, including Microsoft FoxPro and Clip Gallery

.IFD
Form file found in data-capture products from JetForm (now Accelio)

.IFF

Three-dimensional object file used with LightWave, an animation program

.IFF

Three-dimensional object file (Amiga and Electronic Arts Interchange File Format) found in the Imagine and Turbo Silver ray tracer programs, from Impulse

.IFO
Data file used in ImageForge Pro, an image-editing tool developed by CursorArts Company for Microsoft Windows 95

.IFP
Script file used in KnowledgeMan, a database application

.IFS
Compressed fractal image created by Yuvpak, a compression/decompression application

.IFS
Create executable library file found in ImageForge (freeware) and ImageForge Pro, image creating and editing applications from CursorArts

.IFS
System file found in IBM's OS/2 operating system

.IGES (also .IGS)
File based on the Initial Graphics Exchange Specification standard

.IGX
File associated with iGrafx Professional, iGrafx FlowCharter, iGrafx Process, and iGrafx Process for Six Sigma, all from Micrografx

.IIF
Interchange file found in QuickBooks for Windows, from Intuit

.IL8
File created in Adobe Illustrator, version 8

.ILB
Data file created by Scream Tracker, a digital music format

.IM

Three-dimensional object file created in the IRIS Performer program, from Silicon Graphics

.IM8
Raster graphics file from Sun Microsystems

.IMF

Letter file created in IncrediMail, a free, downloadable email program from IncrediMail, Ltd.

.IMG

Main image output file created by Vivid 2.0, an image manipulation utility written by Stephen B. Coy

.IMG
Bit map graphics file found in Corel VENTURA Publisher applications

.IMP
Improve spreadsheet file found in Lotus applications

.IMI

Animation file used in IncrediMail, a free, downloadable email program from IncrediMail, Ltd.

.IMN

Notifier file used in IncrediMail, a free, downloadable email program from IncrediMail, Ltd.

.IMS

Graphics file used in IncrediMail, a free, downloadable email program from IncrediMail, Ltd.

.IMS
Create executable library data file found in IconForge, from CursorArts

.IMW

Sound file used in IncrediMail, a free, downloadable email program from IncrediMail, Ltd.

.IND
Index file used with dBase IV

.IND
Shared database file in Microsoft Windows operating systems

.INDD
File used with Adobe InDesign (1999 release)

.INF
ASCII-based information or set-up text file

.INF
Installation script file found in numerous applications

.INI
Initialization file, found in various applications. This type of file is run when computers boot up or when programs are launched.

.INK
Pantone reference fills file found in CorelDRAW

.INL
Inline function file created in the Microsoft Visual C++ programming language

.INP
Source code form file found in early versions of the Oracle database program

.INS
Instrument file found in applications from Ensoniq, maker of multimedia sound cards and electronic musical instruments

.INS
Install script file used with InstallShield

.INS
Data file found in Corel WordPerfect for Windows

.INS
Instrument music file used in ADLiB, from Information Systems

.INST

Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application

.IPL
Pantone Spot reference palette file found in CorelDRAW

.IRS
Resource file found in Corel WordPerfect for Windows

.IRTP
Three-dimensional object file (Interactive Real-Time PHIGS format) used in the TopGen database modeling application, from AAI/Graphicon

.ISD
Spell checker dictionary file found in RapidFile, from Borland

.ISO
Based on the ISO 9660 CD-ROM file system standard, an .ISO file stores the contents of a CD-ROM. The ISO(International Organization for Standardization) is the body that sets and governs international standards for data communications.

.ISU
Uninstall script file used in InstallShield for Windows

.IT
Music module file associated with the Impulse Tracker digital music format

.ITI
Instrument file associated with the Impulse Tracker digital music format

.ITS
Sample file associated with the Impulse Tracker digital music format

.IV
Three-dimensional object file created in the IRIS Inventor application, from Silicon Graphics

.IW
Screensaver file found in IdleWild, part of the Microsoft Entertainment Pack (versions 1–3)

.IWA
Text file used in IBM Writing Assistant application

.IXA
VCD or SVCD disc image file used in Ulead System's DVD MovieFactory application

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J

.JAR
JavaARchive compressed file for applets and other files (see .JAV for more information).

.JAS/.JASC
Graphics format file used in various Jasc Software applications

.JAV / .JAVA
Source code file for JAVA, a programming language created by Sun Microsystems that writes programs geared for downloading files from the Web. An applet is a small JAVA application.

.JBD
Data file used in SigmaScan, a family of image analysis and measurement applications from SPSS

.JBIG
Document filed based on the Joint Bilevel Image Group standard

.JBF
Image browser file found in Paint Shop Pro, a graphics design and photo-editing application from Jasc Software

.JBX
Project file used in Project Scheduler 4.0, a business application from EnterpriseSoft

.JFF
see .JPEG

.JIF
see .JPEG

.JFIF
see .JPEG

.JNB
Workbook file found in Sigma Plot (version 5.0), a technical graphing program from SPSS

.JOB
Vector graphics file in QuestVision created by the conversion of an IMG file

.JOR Journal file used in SQL Server, a line of database and analysis applications from Microsoft

.JPE
see .JPEG

.JPEG
Joint Photographic Experts Group, a compression format for color bit-mapped images named after the committee that set the compression standard. Files stored in this format may take the .JPEG extension or others, including .JFF, .JIF, .JFIF, .JPE, .JPG, and .JTF, and are used with numerous applications, such as QuickTime Picture.

.JPG
see .JPEG

.JS
JavaScript source code file. Developed by Netscape, JavaScript is a language supported by Netscape Navigator Web browsers.

.JSL
File used in Paint Shop Pro, a graphics design and photo-editing application from Jasc Software

.JSP
File used in JRun Studio, a Java application developer from Macromedia

.JTF
A JPEG Tagged Interchange Format image file

.JTF
A bit map file based on the JPEG (Joint Photographic Expert Group) compression standard for color images

.JTF
Fax document file used with the Hayes JT Fax modem

.JTK
Java toolkit file created by Sun Microsystems

.JW
Text document created in JustWrite, a word-processing application from Symantec

.JWL
Library file found in JustWrite, a word-processing application from Symantec

.JZZ
File used in Jazz, a spreadsheet application from Lotus

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K

.KAR
Karaoke format MIDI (Musical Instrument Digital Interface) music file

.KB
Keyboard script file created in the Borland C++ programming language (version 4.5)

.KB
Knowledge Pro program source code file

.KBD
Keyboard mapping script file used in various applications, including the ProComm Plus terminal emulation applications from Symantec

.KBM
Keyboard mapping script file used in Reflection, a Web-based terminal emulation program from WRQ

.KCL
LISP source code file found in Kyoto Common LISP, an implementation of the LISP (list processing) programming language developed in the 1950s for use in artificial intelligence research

.KDC
Kodak Digital Camera graphics file

.KEX
Macro file used in KEDIT, a text editor for Windows from Mansfield Software

.KEY
Icon toolbar file found in DataCAD, a business-to-business architecture application from DataCAD LLC

.KEY
Data file used in Forecast Pro, a sales forecasting program from Business Forecast Systems

.KEY
A keyboard macro file. A macro is single keyboard stroke that executes a series of keyboard strokes and/or mouse actions.

.KEY
Generic security file, such as a software registration number

.KFX
Image file used in various applications from Kofax Image Products

.KIZ
Kodak Digital Science Picture Postcard file

.KMP
KeyMap file used with the Trinity music workstation from Korg

.KPP
Toolpad file found in SmartPad, from Seiko

.KQP
Camera file native to Konica applications

.KRZ
Downloadable sample file used with Kurzweil Music Systems synthesizers, digital pianos, and other instruments

.KSF
Sample file used with the Trinity music workstation from Korg

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L

.L
Source code file used in LEX (lexical analyzer generator), a compiler for programming languages. A compiler interprets a high-end programming language into a basic language computers understand.

.L
Source code for used in the LISP (list processing) programming language developed in the 1950s for use in artificial intelligence research

.LAB
Label file used with the Visual dBase program

.LAN
Novell Network adapter driver file

.LAY
Clip art file used in Printmaster Gold, a family of drawing applications from Broderbund

.LAY
Layout file used in Applause, data-accessing applications from CUESoft.com

.LBG
Label generator file used in dBASE IV, an interactive database application from dBASE

.LBI
Library file used in Dreamweaver, an HTML editor application from Macromedia

.LBL
Label file used in dBASE IV, an interactive database application from dBASE

.LBL
Label file found in Clipper 5, an application development system from Computer Associates

.LBL
Label file used in dBFast, an Xbase-compatible development system for Microsoft Windows from Computer Associates

.LBM
Labels file found in Microsoft Visual FoxPro

.LBO
Compiled label file used in dBASE IV, an interactive database application from dBASE

.LBR
Display driver file found in the Lotus 1-2-3 spreadsheet program

.LBT
Label description file used in Microsoft Visual FoxPro

.LBX
Label file created in the Microsoft FoxPro database program

.LCK
Database file found in Adobe Pagemaker

.LCN
Dictionary file used in Corel WordPerfect for Windows applications

.LCN
Lection document found in Microsoft WordPerfect for Windows

.LCS
Data history file used in ACT! for Lotus Notes from Symantec

.LD
Long distance are codes file used in Telix for Windows, an online communications program from deltaComm. Development

.LD1
Overlay file used in dBASE, an interactive database application from dBASE

.LDB
Lock file used in the Microsoft Access database management program

.LDL
Library file found in the Corel Paradox family of relational database applications

.LEX
Dictionary/lexicon file found in various applications, including Microsoft Word

.LGO
Startup logo file used in Microsoft Windows applications, beginning with version 3.X

.LIB
Library file found in various applications

.LIN
Line type file used in DataCAD, a business-to-business architecture application from DataCAD LLC

.LIN
Interactive music sequencing data file introduced in Electronic Arts programs

.LIST
Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application

.LIT
File used with Microsoft Reader, a Windows-based application for reading e-books, based on XML (Extensible Markup Language, a protocol for designing Web documents)

.LKO
Linked object file found in Microsoft Outlook Express

.LL3
Document file created in LapLink (version 3.0), a file transfer and synchronization applications from LapLink

.LLX
Exchange agent file used in LapLink, a file transfer and synchronization applications from LapLink

.LNK
A link or shortcut file used in Microsoft Windows operating systems

.LOG
Log file, found in many applications, such as Microsoft Outlook, which keeps track of a computer's or program's activities.

.LOK
Compressed file generated by FileWrangler, a file management application from CursorArts

.LRF
Linker response file created in the Microsoft C and C++ programming languages

.LRS
Language resource file, used in Corel WordPerfect for Windows applications

.LS
Three-dimensional object file found in Lightscape Visualization System, from Lightscape Technologies, Inc.

.LSA
Three-dimensional object file found in Lightscape Visualization System, from Lightscape Technologies, Inc.

.LSB
Three-dimensional object file found in Lightscape Visualization System, from Lightscape Technologies, Inc.

.LSF
Library system file used in LOGOS, a programming language for learners

.LSL
Saved library file used in the Corel Paradox family of relational database applications

.LSL
Saved library file used in Corel PARADOX applications

.LSP
File created in AutoLISP, CommonLISP, and other variations of the LISP (list processing) programming language developed in the 1950s for use in artificial intelligence research

.LST
Spool file used in the Oracle database program from Oracle

.LST
File associated with Microsoft PowerPoint presentation applications

.LTM
Form file used in Lotus Forms

.LWD
Document file created in IBM's LotusWorks

.LWOB
Three-dimensional object file used with LightWave, an animation program

.LYR
Layer file used in DataCAD, a business-to-business architecture application from DataCAD LLC

.LYT
Log file used with TurboTax, from Intuit

.LZW
Compressed file created by the Lempel Ziv Welch data compression application from Unisys

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M

.M
Program file found in MATLAB, a technical computing application from The MathWorks

.M
Standard package file used in Mathematica, a technical computing program from Wolfram Research

.M1V
Video file based on the MPEG standard. Moving Pictures Experts Group is a committee that sets the compression standard for digital audio and video files

.M3D
Three-dimensional animation file used in Corel MOTION, an application introduced in CorelDRAW 6

.MAC
A bit-mapped image generated by MacPaint, a graphics application from Macintosh

.MAC
A macro file used in various applications. A macro is a single keyboard stroke that executes a series of keyboard strokes and/or mouse actions.

.MAD
Module file found in the Microsoft Access database management program

.MAF
Form file used in Microsoft Access, a database management application

.MAGIC
Configuration file for Magic Mail Monitor, an e-mail program

.MAK
Project file used in Microsoft Visual Basic and with the Microsoft C++ programming language

.MAM
Macro file used in Microsoft Access, a database management application

.MAP
Atlas MapMaker map file; also, a generic map file used in various programs

.MAP
Data file found in Micrografx Picture Publisher

.MAP
Map file used for color choices in Pro/ENGINEER, a 3D engineering program from PTC

.MAQ
Query file created in the Microsoft Access database management program

.MAR
Report file used in Microsoft Access, a database management application

.MAS
Lotus Freelance SmartMaster graphics file

.MAT
Table file used in Microsoft Access, a database management application

.MAT
Data file used in MATLAB, a technical computing application from The MathWorks

.MAX
3D scene file created with Kinetix 3D Studio MAX

.MAX
Layout file used in the Orcad line of products from Cadence Design Systems

.MAX
Scanned image file used with Paperport, a scanner application from Visioneer

.MAZ
Three-dimensional object file found in dVice, from Division Ltd.

.MB
Memo field values file found in the Corel Paradox family of relational database applications

.MBF
Money backup file found in Microsoft Works Suite 2002

.MBK
Saved e-mail file created in Microsoft Outlook

.MCC
Configuration file used with Mathcad, a technical calculation application

.MCD
Document file used with Mathcad, a technical calculation application

.MCF
Multichannel file found in Xtrack Live, an optional tool that works with Xrack 4.1, from Digigram

.MCF
Font file found in Mathcad, a technical calculation program from Math Soft Engineering and Education

.MCP
Printer driver file used in Mathcad, a technical calculation program from Math Soft Engineering and Education

.MCR
Keyboard macro file found in DataCAD, a business-to-business architecture application from DataCAD LLC.

.MCW
Microsoft Word for Macintosh document file

.MCW
MacWrite II text document

.MDA Add-in file used in the Microsoft Access database management program

.MDB
Database file for Microsoft Access, a database management application

.MDE
File associated with the Microsoft Access database management program

.MDL
Music module file used with Digital Trakker

.MDL
Model file found in Quake, a series of 3-D action games from id Software

.MDL
Aircraft model file used in Microsoft Flight Simulator 2002

.MDL
Three-dimensional model file used in TurboCAD, a line of computer-aided design products from IMSI

.MDL
Three-dimensional model file used in the Moray modeling application

.MDM
Modem definition file used with Telix for Windows, an online communications program from deltaComm. Development

.MDN
Database template found in the Microsoft Access database management program

.MDT
Data file used in the Microsoft Access database management program

.MDW
Workgroup file used in the Microsoft Access database management program

.MDX
Multiple index file found in dBASE IV, a database application from dBASE

.MDZ
Wizard template found in the Microsoft Access database management program

.ME
Text document file—such as "READ.ME"—in ASCII format (see .ASC)

.MED
Music module file used with OctaMED Music Editor

.MEDIT
Three-dimensional object file found in the Medit database modeling program, from Medit Productions

.MEM
Memory variable save file found in CA-Clipper, an application development system from Computer Associates

.MEM
Memory variable save file in dBASE IV, a database application from dBASE

.MEM
Memory variable save file used in the Microsoft FoxPro database program

.MES
Message file found in various applications

.MESH
Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application, and the Meshview program developed at the University of Indiana

.MEX
Executable command file found in MATLAB, a technical computing application from The MathWorks

.MFG
Manufacturing file used with Pro/ENGINEER, a 3D engineering program from PTC

.MGC
Media Catalog file used with Microsoft Office's Clip Organizer

.MGF
Font file used in various MicroGrafx applications

.MGF
Three-dimensional object file (Materials and Geometry Format) created by Greg Ward

.MHP
Picture It! multimedia format file found in Microsoft Works Suite 2002

.MHT
Web archive file found in the Microsoft Office 2002 suite

.MHTL
Web archive file found in the Microsoft Office 2002 suite

.MIC
File associated with Microsoft Image Composer

.MID
A music file created with the Musical Instrument Digital Interface protocol. MIDI is the standard format for transforming music sounds into data (and vice versa). Used with computers and music synthesizers.

.MIM (see also .MME)
A multipart file created in the MIME(Multipurpose Internet Mail Extensions) format. MIME is the standard format for attaching non-text files, such as spreadsheets, to e-mail messages. An attachment with the .MIM extension can be opened with a decompression program such as WinZip.

.MIX
Picture file generated by Microsoft PhotoDraw 2000

.MIX
Microsoft Picture It! Publishing picture file

.MIX
miXart console save file found in miXart8 and miXart8CN (CobraNet I/O for miXart8), from Digigram

.MLM
E-mail file created in GroupWise, a family of e-mail and collaboration applications from Novell

.MM
Text file found in Multimate Advantage II, from Borland

.MME
see .MIM

.MMF (see also .MSG)
Microsoft Mail message file

.MMM
Multimedia movie file created with MacroMind Director (version 3.X), from MacroMind (Macromedia)

.MMM
Microsoft Multimedia Movie file

.MND
Menu source file used with the AutoCAD Menu Compiler from Autodesk

.MNG
Map file found in AAA Map'n'Go, from DeLorme Mapping

.MNT
Menu file found in the Microsoft FoxPro database program

.MNU
Menu file found in Visual dBASE, a database program from dBASE

.MNX
Menu file found in the Microsoft FoxPro database program

.MNX
Compiled menu file created in AutoCAD, a general design application from Autodesk

.MNY
Money document file found in Microsoft Works Suite 2002

.MOD
Three-dimensional object file used in the Wavefront line of animation applications, from Wavefront/Alias Technologies

.MOV
Movie file format associated with Apple's QuickTime for Microsoft Windows

.MOV
Movie file found created in PowerPoint (Microsoft Office 2001)

.MOVIE
A video file created with QuickTime, a Macintosh video application

.MP2
MPEG Audio Layer 2 file. MPEG stands for Moving Pictures Experts Group, a committee that sets the compression standard for digital audio and video files.

.MP3
MPEG Audio Layer 3 file. MPEG stands for Moving Pictures Experts Group, a committee that sets the compression standard for digital audio and video files.

.MPC
Calendar file created in Microsoft Project, a project management application program in Office 2000

.MPD
Database file created in Microsoft Project, a project management application program in Office 2000

.MPE
Animation file using the standard set by the Moving Pictures Experts Group, a committee that sets the compression standard for digital audio and video files.

.MPG
Animation file using the standard set by the Moving Pictures Experts Group, a committee that sets the compression standard for digital audio and video files.

.MPP
Project file created in Microsoft Project, a project management application program in Office 2000

.MPR
Compiled menus file found in the Microsoft FoxPro database programs

.MPS
Pocket Streets map file found in Microsoft Works Suite 2002

.MPV
View file used in Microsoft Project, a project management application program in Office 2000

.MPV
A video file based on the MPEG digital video compression standard

.MPX
Compiled menu program file created in the Microsoft FoxPro database applications

.MPX
Exchange file used with Microsoft Project, a project management application program in Office 2000

.MRB
Multiple resolution bitmap graphics file used with the Microsoft C and C++ programming languages

.MSC
Makefile used with the Microsoft C programming language

.MSDL
Three-dimensional object file (Manchester Scene Description Language format) created at the University of Manchester in England

.MSG (see also .MMF)
Microsoft Mail Message file

.MSP
Bit-mapped file found in Microsoft Paint, a Windows patch install file, or a Magix Media Studio project file

.MSW
Text file used in Microsoft Word

.MTV
Three-dimensional object file found in the MTV ray tracer application

.MU
Menu file found in Quattro Pro, from Corel

.MULAW
Generic audio file used with various audio applications

.MUS
Music audio data file found in applications from Electronic Arts

.MUS
Music file for MusicTime Deluxe, a music notation program developed by Passport Design Systems and now owed by GVOX

.MVF
Stop frame file found in AutoCAD, a general design application from Autodesk

.MVI
Movie command file used in AutoCAD, a general design application from Autodesk

.MWP
Smartmaster file used with Lotus WordPro 97

.MXT
Data file created with the Microsoft C programming language

.MYS
Saved game file for Myst, from Redorb Entertainment / Broderbund

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N

.NB
Text file used in Nota Bene, an academic research and writing application from Nota Bene Associates

.NCB
File found in Microsoft Developer Studio

.NCC
Computer numeric control file found in CamView 3D

.NCF
Internal clipboard file used in Lotus Notes

.NCS
Novell Netware command script file

.NDX
Index file used with dBASE database applications (versions II, III, and IV), from dBASE

.NDX
Index file found in CINDEX, an index preparation program from Indexing Research

.NET
Netlist output file found in Orcad Schematic Capture, from Cadence Design Systems

.NET
Configuration file used with various networks and servers. It contains commands dictating the way a network system is set up.

.NFF
Three-dimensional object file found in the MTV ray tracer application

.NFF
Three-dimensional object file (Neutral File Format) created by Eric Haines and used in various applications, including the Standard Procedural Database and free ray tracers

.NFF
Three-dimensional object file (ASCII) found in the WorldTookKit graphics program, from Sense8

.NLB
Data file used in Oracle 7, a database program from Oracle

.NLM
Novell Netware loadable module file

.NLX
Form file found in FormWorx 3.0

.NS2
A database file found in Lotus Notes 2. Subsequently numbered files, such as .NS3, are database files in the next version of the program.

.NSF
Database file created in Lotus Notes

.NSO
Document file found in NetObjects Fusion, an HTML (Hypertext Markup Language) editing application from NetObjects

.NST
Music module file used in Noise Tracker

.NT
Startup file associated with Microsoft Windows NT operating system

.NTF
Database template file used in Lotus Notes applications

.NTF
Database template used in Lotus Notes

.NTX
Index file used in the CA-Clipper, an application development system from Computer Associates

.NUF
Message file created for new users in ProComm Plus terminal emulation applications from Symantec

.NURBS
Three-dimensional object file (Nonlinear Uniform Rational B-Splines format) created by the Computer Science Department of the University of Utah for its Alpha_1 geometric modeling program

.NWC
Song file created in NoteWorthy Composer, a music composition and notation processor for Windows, from NoteWorthy Software

.NWC
Song file found in NoteWorthy Composer, a music composition processing application for Windows from NoteWorthy Software

.NWS
News file generated by Microsoft's Outlook Express e-mail program

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O

.O
Object file used in the Unix operating system

.OAB
Address Book file used with Microsoft's Outlook e-mail application

.OAZ
Fax file found in NetFax Manager, from OAZ Communications

.OBD
Binder template file found in the Microsoft Office suite of applications

.OBD
Binder file associated with the Microsoft Office suite

.OBJ
Three-dimensional object file used in the Wavefront line of animation applications, from Wavefront/Alias

.OBJ
Three-dimensional object file found in the xdart and x3d (version 2.0) rendering programs

.OBR
Object browser data file used with the Borland C++ programming language

.OBS
Script file created in ObjectScript, an object-oriented programming language from Source Forge

.OBT
Office binder template file found in Microsoft Works Suite 2002

.OBV
Visual interface file found in ObjectScript, an object-oriented programming language from Source Forge

.OBZ
Office binder wizard file found in Microsoft Works Suite 2002

.OCR
Transcribed fax-to-text file used with FAXGrabber, from Caere

.OCT
Three-dimensional object file (binary octree format) created by Greg Ward and found in the Radiance radiosity renderer, a free application made for the Unix operating system

.ODIF
A binary file based on the Open Document Interchange Format, which is associated with Open Document Architecture

.ODL
Library source file used with the Microsoft Visual C++ programming language

.ODL
Three-dimensional object file created in the Object Description Language

.ODS
Mailbox file created in the Microsoft Outlook Express e-mail program

.OFD
Form definition file found in ObjectView

.OFF
Three-dimensional object file (Object File Format) developed by Digital Equipment Corp. for use with a variety of platforms, programs, and languages

.OFF
Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application, as well as the Meshview program developed at the University of Indiana

.OFT
Template file used in Microsoft's Outlook e-mail application

.OFN
FileNew documents found in the Microsoft Office suite

.OLB
Object library file developed by Microsoft

.OLD
Backup file found in various applications

.OLE
OLE (object linking and embedding) object file. Object linking and embedding is a process by which information is shared between different applications within an operating system.

.OLE
An Object Linking and Embedding custom control file in Microsoft applications. OLE is a method of sharing information (by way of linking or embedding) between different applications within an operating system.

.OOGL
Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application. In addition, this extension identifies WebOOGL files, a format that enables URL links to be embedded in 3D objects.

.OPJ
Project file found in Orcad Schematic Capture, from Cadence Design Systems

.OPS
Office profile settings file found in Microsoft Works Suite 2002

.OPT
File used in Microsoft Developer Studio

.ORA
Parameter file used in the Oracle database applications from Oracle

.ORA
Configuration file used in the Oracle database applications from Oracle

.ORC
Script file found in Oracle 7, a database program from Oracle

.ORG
Calendar file used in Lotus Organizer, a personal information manager application

.OR2
Calendar file used in Lotus Organizer 2, a personal information manager application

.OR3
Calendar file used in Lotus Organizer 97, a personal information manager application

.OSS
Saved search file created in the Microsoft Office suite

.OST
Offline file associated with Microsoft's Outlook e-mail program

.OST
Offline file created in the Microsoft Outlook e-mail program

.OTL
Template file found in Super NoteTab, an HTML editor from Fookes Software

.OTL
Template file used in PrintMaster Gold, a family of drawing applications from Broderbund

.OTX
Text file found in Olitext Plus, from Olivetti

.OUT
Output file created with the Microsoft C programming language

.OV
Database file used in Revelation, a DOS-application development program from Revelation Software

.OVE
Score file in Cakewalk Overture, a music and sound production application from Twelve Tone Systems, Inc.

.OVL
Legal document library file found in legal applications, such as Family Lawyer, from Broderbund

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P

.P
Source code used with Pascal, a high-level programming language developed by Niklaus Wirth in 1971

.PA1
Worktable file found in PageAhead Software applications

.PAB
Personal Address Book file used in Microsoft's Outlook e-mail program

.PAK
Compressed archive file

.PAK
WAD file used in the Quake game, from id Software; a WAD file contains information about the game, such as game levels, characters, and images

.PAL
Color palette file used in various applications, including Microsoft programs

.PAL
Library palette file found in Adobe Pagemaker

.PAN
Printer specific file used in CorelDRAW applications

.PAR
Permanent output file generated in Microsoft Windows 3.x operating systems

.PAS
Source code file used with the Borland Pascal programming language

.PAT
Hatch pattern file found in DataCAD, a business-to-business architecture application from DataCAD LLC

.PAT
Pattern file found in CorelDRAW applications

.PB
Phone book file used in WinFax PRO, a fax management application from Symantec

.PB1
Backup Plan file created in 3D Home Architect (v. 4.0), from Broderbund

.PBD
Phone book file used in the FaxIT shareware application

.PBD
Dynamic library file used in PowerBuilder, a database development application

.PBI
Profiler binary input file found in Microsoft Source Profiler, a component of Visual C++ 5.0 and 6.0

.PBK
Phonebook file associated with Microsoft applications

.PBL
Library file used in PowerBuilder, a database development application

.PBM
Portable bit map graphics file used in applications from Jasc Software

.PBO
Profiler binary output file used in Microsoft Source Profiler, a component of Visual C++ 5.0 and 6.0

.PBR
Resource file used in PowerBuilder, a database development application

.PC
Text file found in IBM computers and applications

.PC
ZSoft PC Paintbrush bit map file

.PCB
PowerPoint application data file

.PCC
Cutout picture vector graphics file found in ZSoft PC Paintbrush

.PCD
Photo CD file created by Eastman Kodak

.PCE
Name map file used in Eudora Mailbox family of e-mail applications

.PCF
Profiler command file used in Microsoft Source Profiler, a component of Visual C++ 5.0 and 6.0

.PCH
Precompiled header file used in the Microsoft C and C++ programming languages

.PCI
PCI miniport file used with Microsoft Windows system files

.PCL
Printer Control Language file developed by Hewlett-Packard

.PCM
Pulse code modulation (audio) file

.PCP
Live Update Pro file, a downloadable feature for Norton Utilities 3.0 for Windows 95

.PCS
Picture storage file found in Microsoft PowerPoint presentation software

.PCT (see also .PIC / .PICT)
Graphics file based on the PICT graphics format developed by Apple in 1984; used with graphics applications designed for Macintosh computers

.PCX
Bit map graphics file created in ZSoft PC Paintbrush

.PDB
File used in Pegasus database programs

.PDB
Database and document file used with 3Com's PalmPilot wireless devices

.PDB
Physical model backup file used in PowerDesigner, a series of database design applications from Sybase

.PDD
Graphics file used with Paint Shop Pro, from Jasc Software, and Adobe PhotoDeluxe

.PDD
Image file used in Adobe PhotoDeluxe

.PDF (see also .ABF)
File type of output from Adobe Acrobat software (1993 release), other Adobe applications, and Microsoft Office applications (if the user has full Acrobat installed)

.PDF
Printer definition file used with Novell Netware

.PDG
Data file used in PrintShop Deluxe, a graphics application from Broderbund

.PDL
Project description language file used with the Borland C and C++ programming languages

.PDM
Physical model file used in PowerDesigner, a series of database design applications from Sybase

.PDP
File used in PrintShop Deluxe, a graphics application from Broderbund

.PDS
Data/archive files from the Planetary Data System, sponsored by NASA's Office of Space Science

.PDT
Database file created in ProCite, an Internet search and reference-building application from ISI ResearchSoft

.PDX
Database index file created in ProCite, an Internet search and reference-building application from ISI Research Software

.PDX
Catalog index file found in Adobe Acrobat

.PE3
Image archive file used with QuickViewer, an e-mail viewing application from Novell

.PE3
Image archive file used in PhotoImpact, from Ulead Systems

.PEB
Program editor bottom overflow file used with Corel's WordPerfect for Windows library

.PED
Program Editor delete save file used with Corel's WordPerfect for Windows library

.PEM
Program Editor macro file used with Corel's WordPerfect for Windows library

.PEQ
Program Editor pint queue file used with Corel's WordPerfect for Windows library

.PER
Program Editor resident area file used with Corel's WordPerfect for Windows library

.PES
Program Editor workspace file used with Corel's WordPerfect for Windows library

.PET
Program Editor top overflow file used with Corel's WordPerfect for Windows library

.PFC
Personal Filing Cabinet file used in the America Online Internet access program

.PFD
File used in Optima, a process application from Micrografx

.PFK
Programmable function keys file in XTree and XTree Gold, disk management programs by Central Point Software

.PFK
Programmable function keys file used with XTreePro, a disk management program from Central Point Software

.PFR
File associated with Paint Shop Pro from Jasc Software

.PFS
Word processing file generated by pfs:Write, versions 1.X–2

.PFT
Printer font file used with ChiWriter, a scientific word processing application from Horstmann Software Development

.PGM
Portable grayscale bit map file used with the Unix operating system

.PGM
Program file used in Signature Software, a digital handwriting application

.PGN
Portable game notation file used in various gaming applications, such as ChessMaster, from The Learning Co.

.PH
Phrase table file created in the Microsoft C and C++ programming languages

.PHD
PolyHedra Database three-dimensional object file found in Kaleido and IRIS Inventor, from Silicon Graphics

.PHN
Phone list file used with UltraFax, and Internet-based faxing service from UltraNet

.PHR
Phrases file found in Locoscript, a localization and translation service

.PIC
3D image file found in Softimage, a visual content creation application from Softimage

.PIC
Bit-mapped graphic file found in PC Paint

.PIC
Picture file used with Lotus applications

.PIC / .PICT
Graphics file based on the PICT graphics format developed by Apple in 1984; used with graphics applications designed for Macintosh computers

.PIF
Program information file, used in various applications

.PIF
Compressed archive file used in Macintosh applications

.PIN
Data file used in the Epic Pinball game from Epic MegaGames, Inc.

.PJ
Project file used in Super Project, a family of project management applications for eBusinesses, from Computer Associates

.PJX
Project file used in Microsoft's Visual FoxPro database application

.PJT
Memo file found in the Microsoft Visual FoxPro database program

.PJT
Project file used in the Microsoft Visual FoxPro database program

.PL1
First Floor Plan file created in 3D Home Architect (v. 4.0), from Broderbund

.PL2
Second Floor Plan file created in 3D Home Architect (v. 4.0), from Broderbund

.PL3
Third Floor Plan file created in 3D Home Architect (v. 4.0), from Broderbund

.PL
Source code file used in Perl, a high-level programming language created by Larry Wall

.PL
Source code file used in Prolog, a logic programming language

.PLB
Library file used in Microsoft's Visual FoxPro database application

.PLC
Add-in file used in the Lotus 1-2-3 spreadsheet programs

.PLG
Three-dimensional object file (PoLyGon format) found in the REND386, VR386, AVRIL and Gossamer graphics applications

.PLI
Data description file used in Oracle 7.0, a database program from Oracle Corp.

.PLL
Pre-linked library file found in the Clipper 5, an application development system from Computer Associates

.PLM
Module (music) file used with DisorderTracker2

.PLN
File associated with Corel's WordPerfect for Windows application

.PLN
Saved flight plan file created in Microsoft Flight Simulator 2002

.PLR
Pilot file used in the Descent game from Descent Network Team

.PLS
Sample file used with DisorderTracker2

.PLT
Plot drawing file used with AutoCAD, general design software from Autodesk

.PLT
Prelinked transfer file found in Clipper 5, an application development system from Computer Associates

.PLT
Palette file used in various graphics applications

.PLT
Organizer layout files used in SmartSuite, from Lotus

.PLY
Data file used in PopMail, a free, downloadable e-mail application

.PLY
Presentation screen file used in Harvard Spotlight, a shareware application from Software Publishing

.PLY
Three-dimensional object file created by ZipPack, from Silicon Graphics

.PM3
Document file found in Adobe PageMaker 3.0

.PM4
Document file found in Adobe PageMaker 4.0

.PM5
Document file found in Adobe PageMaker 5.0

.PM6
Document file found in Adobe PageMaker 6.0

.PM
Presentation Manager graphics file used in IBM's OS/2 operating system

.PMD
File used in Adobe PageMaker applications

.PNG
File used in Fireworks 4.0, a Web graphics design application from Macromedia

.PNG
Picture It! main file format found in Microsoft Works Suite 2002

.PNG
A file created in the Portable Network Graphics format

.PNG
Browser catalog file used with Paint Shop Pro, a graphics design and photo editing application from Jasc Software

.PNT
Pen Table plotting file used in Pro/ENGINEER, a 3D engineering program from PTC

.PNT
Graphics file used in MacPaint

.POP
Pop-up menu file used in the dBase database program

.POG
File found in the Descent game (version 2) from Descent Network Team

.POL
A native three-dimensional data file format found in applications from InnovMetric Software Inc.

.POLY
Three-dimensional object file (ASCII format) used in the PRISMS database application, from Side Effects Software

.POP
Pop-up file used in Visual dBASE, a database application from dBASE

.POP
Message index file found in PopMail, an e-mail application from PopMail.com

.POT
Template file used with Microsoft's PowerPoint presentation application

.POV
Three-dimensional scene description language file used in POV-Ray (Persistence of Vision ray tracer), a free 3D graphics application

.PP
Compressed Amiga archive file used in PowerPacker, for PalmPilots

.PP4
Picture Publisher 4.0 file from Micrografx

.PP5
Picture Publisher 5.0 file from Micrografx

.PPA
Add-in file used with Microsoft's PowerPoint presentation application

.PPF
File used in iGrafx Image and Micrografx Picture Publisher, both raster-image products from Micrografx

.PPF
Presentation file used in Paint Shop Pro 7.0, from Jasc Software

.PPI
Graphics file used in Microsoft's PowerPoint presentation application

.PPM
Portable pixmap color image file created by the PBMPLUS toolkit

.PPO
Preprocessed output file used with Clipper 5, an application development system from Computer Associates

.PPP
Publication file used in the PagePlus family of desktop publishing applications from Serif

.PPS
Slide show file used in Microsoft's PowerPoint presentation application

.PPT
Presentation file created with Microsoft's PowerPoint presentation application

.PPX
Publication file used in the PagePlus family of desktop publishing applications from Serif

.PQB
Master book backup file found in PowerQuest BootMagic, a storage application from PowerQuest

.PR2
Printer driver file used with dBASE IV, a database application from dBASE

.PR2
Presentation file used in Aldus Persuasion 2.X, a desktop presentation application for Macintosh

.PR3
Presentation file used in Aldus Persuasion 3.X, a desktop presentation application for Macintosh

.PR3
Postcript printer deriver file used with dBASE IV, a database application from dBASE

.PR4
Presentation file generated by Harvard Graphics for Windows 7.0

.PRC
Resource file used with the PalmPilot

.PRD
Printer driver file used with various applications; a printer driver allows a computer to communicate with a printer

.PRE
Settings file used with the Microsoft C and C++ programming languages

.PRE
Presentation file generated by Lotus Freelance

.PRF
Settings file found in Macromedia Director, a multimedia authoring program

.PRF
Printer drive file used in dBASE IV, a database application from dBASE

.PRG
Program source file used in various applications, including dBASE IV, Clipper 5, and Microsoft Visual FoxPro

.PRG
Program file used in WAVmaker, a MIDI-related application from Polyhedric Software

.PRG
Program source files used in various applications

.PRN
Text file used in Lotus 1-2-3 Symphony

.PRN
Windows printer file used in DataCAD, a business-to-business architecture application from DataCAD LLC

.PRO
Source code file found in the Prolog programming language

.PRO
Project file used in Terramodel, a 3D land modeling application from Spectra Precision Software

.PRO
Configuration file found in Pro/ENGINEER, design software from Parametric Technology

.PROP
Three-dimensional object file found in the Application Visualization System application, from Advanced Visual Systems, Inc.

.PRS
Presentation file used in Harvard Graphics for Windows, versions 1–3

.PRS
Printer resource font file used with Corel WordPerfect for Windows

.PRS
Procedure file found in the dBASE IV database program

.PRT
Part file found in Pro/ENGINEER, a 3D engineering program from PTC

.PRX
Compile program file used in Microsoft Visual FoxPro

.PRZ
Graphics file used in Lotus Freelancer 97, a personal information manager application

.PS
File created in PostScript, an Adobe Systems page description language program used by printers to read the contents of a page before it is printed

.PSD
Bit map file used in Adobe Photoshop (1990 release)

.PSF
Outline PostScript printer font file used with ChiWriter, a scientific word processing application from Horstmann Software Development

.PSM
Sound data file found in the Epic Pinball game from Epic MegaGames

.PSM
Symbol table file found in the Turbo Pascal programming language

.PSP
Pocket Streets pushpin file found in Microsoft Works Suite 2002

.PSP
Image file used in Paint Shop Pro applications from Jasc Software

.PST
Personal Folder file used in Microsoft's Outlook e-mail program

.PSW
Document created in Pocket Word in Microsoft Office 2002

.PT3
Template file found in Adobe PageMaker 3.0

.PT4
Template file found in Adobe PageMaker 4.0

.PT5
Template file found in Adobe PageMaker 5.0

.PT6
Document created in Adobe Photoshop, version 6

.PTB
Table file used with Pro/ENGINEER, a 3D engineering program from PTC

.PTD
Table file used with Pro/ENGINEER, a 3D engineering program from PTC

.PTR
QWK Reader pointer file used with the qmail e-mail software program

.PTU
Three-dimensional object file (Performer Terrain Utilities format) found in IRIS Performer, from Silicon Graphics

.PUB
Publication file used in Corel's VENTURA Publisher

.PUB
Document file created in Microsoft Publisher

.PVD
Script file found in Instalit, an installation application

.PVL
Library file used in Instalit, an installation applications

.PWD
Document file used in Microsoft Pocket Word

.PWP
Text document used in Professional WritePlus, the word processing tool in Page Plus 6.0 from Serif

.PWZ
Wizard file found in Microsoft PowerPoint. A wizard gives step-by-step instructions for using an application's features.

.PX
Primary database index file used in Paradox, from Broderbund

.PXL
Spreadsheet file used in Microsoft Pocket Excel

.PY
Saved e-mail messages created in the Yahoo! e-mail program

.PY
Saved e-mail message file used with the Yahoo! e-mail program

.PZD
Default settings file found in Pizazz Plus, a family of screen capture programs from Application Techniques

.PZO
Overlay file found in Pizazz Plus, a family of screen capture programs from Application Techniques

.PZP
Palette file found in Pizazz Plus, a family of screen capture programs from Application Techniques

.PZT
Transfer file found in Pizazz Plus, a family of screen capture programs from Application Techniques

.PZX
Swap file used with found in Pizazz Plus, a family of screen capture programs from Application Techniques

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Q

.QAD
Document file in QuickArt, a clip-art library from Wheeler Arts

.QAG
Data file used in Quick Access Group, from Norton Desktop/Symantec

.QAP
Application file used in Omnis Quartz, developer software from Raining Data Corp.

.QBE
Saved query file created in the dBASE IV database program from dBASE

.QBE
Saved query file created in Quattro Pro, from Corel

.QBO
Compiled query file created in dBASE IV

.QBW
Data file found in QuickBooks for Window, a spreadsheet application from Intuit

.QCP
PureVoice file from QUALCOMM Inc. PureVoice is a voice-enabling software application for wireless/portable devices.

.QD0
Data file (segment 10), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QD1
Data file (segment 1), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QD2
Data file (segment 2), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QD3
Data file (segment 3), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QD3D
Metafile for the QuickDraw 3D game from Macintosh

.QD4
Data file (segment 4), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QD5
Data file (segment 5), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QD6
Data file (segment 6), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QD7
Data file (segment 7), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QD8
Data file (segment 8), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QD9
Data file (segment 9), created in Omnis Quartz, a line of database development programs from Omnis Software/Raining Data

.QDF
Data file used in Quicken, home finance software from Intuit

.QDK
Backup file containing startup files for QEMM, a memory-boosting family of programs from Symantec

.QDT
Data file found in QuickBooks from Intuit

.QEF
Query file created in the Microsoft Excel spreadsheet application

.QEF
Query file found in the Microsoft Excel spreadsheet program

.QEL
Electronic library file used in Quicken, home finance software from Intuit

.QFL
Document file found in FamilyLawyer, from The Learning Co.

.QFX
File used in QuickLink, a fax/mobile phone application from Smith Micro Software

.QIF
Import file used in Quicken, home finance software from Intuit

.QIF
Image file used in QuickTime, an Apple application that allows Mac and Windows users to play audio and video files on their PCs

.QLB
Library file used with the Microsoft C and C++ programming languages

.QPQ
Project file in Corel's Quattro Pro

.QPX
Generated query program file found in Microsoft Visual FoxPro

.QRS
Equation editor support file used in Corel's WordPerfect for Windows

.QRT
Three-dimensional object (scene) file found in the QRT ray tracer

.QRY
Query file created in dBASE IV, a database application from dBASE

.QSD
Date file used in Quicken, home finance software from Intuit

.QT
Movie file associated with QuickTime, an Apple application that lets Mac and Windows users play audio and video files on their PCs. QuickTime was originally released in 1991; the current version is QuickTime 5.0.

.QTI
QuickTime image file

.QTIF
QuickTime image file

.QTM
QuickTime movie file

.QTP
Preferences file found in QuickTime, an Apple application that allows Mac and Windows users to play audio and video files on their PCs

.QTS
QuickTime image file

.QTVR
Three-dimensional scene file (QuickTime Virtual Reality platform), from Apple

.QTX
QuickTime image file

.QUAD
Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application

.QW
Write program file found in the Q&A applications from Symantec

.QWK
Message file created in the QWK Reader e-mail application

.QXD
Data file used in Quark Xpress, a desktop publishing application that debuted in 1987. The current version is 5.0.

.QXL
Element library file found in the Quark Xpress family of desktop publishing programs

.QXP
Document created in the Quark Xpress desktop publishing program

.QXT
Template filed used in the Quark Xpress desktop publishing application

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R

.R
Resource file used in the Pegasus Mail e-mail application

.RA
RealAudio file, played on the RealPlayer from RealNetworks

.RAD
Radar data file created in Radar ViewPoint, a radar data analysis application from Airways Technology

.RAD
Three-dimensional native file format found in Radiance, a free ray tracer (architectural rendering) application designed primarily for the Unix operating system by the Lawrence Berkeley National Laboratory

.RAM
Metafile used with the RealAudio, played on the RealPlayer from RealNetworks

.RAO
File used in ReadAllOver, an imaging software from YOUniverse Systems

.RAR
Compressed archive file created by RAR Archiver

.RAS (see .RF, .SRF, .SUN)
Sun Raster graphics file, from Sun Microsystems. A raster graphic is a digital image named for the viewing area on a computer's monitor.

.RAY
Three-dimensional object file used in the RayDream animation program, from Ray Dream, Inc.

.RAY
Three-dimensional object file found in Rayshade, a freeware ray tracer for the Unix operating system created by Craig Kolb

.RBF
Data file created in R:BASE, a family of multiuser database applications from R:BASE Technologies

.RC
Resource script file used with the Microsoft C and C++ programming languages, as well as the Borland C++ programming language

.RC
Configuration file used in Emacs, a real-time display editor from GNU Software

.RCG
Newsgroup file used with Netscape Navigator Internet browser

.RCH
Script file associated with Applause (CUESoft.com) applications running on PalmPilots

.RD1
File used in Ray Dream Designer Graphics 1.0, a three-dimensional graphics application from MetaCreations Corp. Subsequently numbered files (.RD2, for example) are from newer versions of the program.

.RDF
Compiled UIC source code file used with Geoworks UI Compiler

.RDL
Registered level file created in the Descent gaming application from Descent Network Team

.REC
Data file used with the Epilnfo statistics application

.REC
Voice file found in RapidComm, from U.S. Robotics

.REC
Recorded macro file found in Microsoft Windows 3.x operating systems

.REG
Registration file, found in various applications

.REG
Registration file found in the Microsoft Windows 3.X operating system

.REP
Reply file created with the QWK Reader e-mail program

.REP
Report file created in Visual dBASE, a database application from dBASE

.REP
Report file created with Visual Report Designer, from Timberline Software

.REP
Report file used in DataBOSS, a relational database application development system for Windows

.REP
Report file created in CodeReporter, a report writer program from HALLoGRAM Publishing

.REP
Organizer layout files used in SmartSuite, from Lotus

.RES
Resource file used with the Microsoft Visual C++ programming language

.RES
Compiled resource file created with the Borland C++ programming language

.RES
Resource file created by the dBASE IV database application, from dBASE

.REV
Revision file used in GeoWorks, a mobile communications platform

.REX
Source code file used with the Rexx procedural programming language

.REX
Report definition file created in the Oracle database application, from Oracle

.RF
Raster graphics file created by Sun Microsystems

.RF (see .RAS)
Sun Raster graphics file, from Sun Microsystems

.RH
Resource header file used with the Borland C++ programming language (version 4.5)

.RI
Product registration information file used in Lotus SmartSuite

.RIB
Three-dimensional object file created in the Renderman Interface Bytestream protocol, from Pixar Animation Studios

.RIF
Image file used in MetaCreations Painter 5.0 for Macintosh

.RIF
RIFF bit map graphics file used in Painter, from Fractal Design

.RIFF
Multimedia file created in the Resource Interchange File Format, from Microsoft

.RIS
Three-dimensional object file (Range Image Standard format) used in the REPLICA and REVERSA programs

.RIX
Bit map graphics file that is the native format of the ColoRIX VGA Paint program

.RL1
Registered level file created in the Descent gaming application (version 1), from Descent Network Team

.RL2
Registered level file created in the Descent gaming application (version 2), from Descent Network Team

.RLE
Run-length encoded file for Windows, a variation of the .BMP (bit map) file.

.RLZ
Realizer source code file found in CA-Realizer, a visual development application from Computer Associates

.RM
RealMedia video file, played on the RealPlayer from RealNetworks

.RMD
Document file used in RegMaid, a downloadable Microsoft tool used for cleaning a system's registry

.RMF
Rich Map Format file, used in various 3-D games to store maps

.RMF
Rich Music Format audio file from Beatnik

.RMI
MIDI (musical instrument digital interface) music file, used in various applications; MIDI is the protocol for changing musical sounds into electronic data

.RMK
Make file used in Clipper RMake, from Computer Associates

.RMM
Media file used with RealPlayer

.RN
Program file found in Nota Bene, an academic research and writing application from Nota Bene Associates

.RND
Rendering slide file used with AutoCAD, general design software from Autodesk

.RNX
Media file used with RealPlayer

.ROV
Data file used in the Rescue Rover gaming application from id Software

.RPD
Database file used in RapidFile, a database application from Ashton-Tate

.RPL
Text document file used in Replica Technology three-dimensional object libraries

.RPL
Video file found in the Tomb Raider gaming application from Eidos Interactive Limited

.RPM
Media file that runs on RealPlayer from RealNetworks

.RSC
Resource file, found in various applications

.RSL
Reports file crated in Paradox 7 from Broderbund

.RSM
Resume file found in Winway Resume Writer, for Windows 95/98

.RTF
Rich Text Format document file. RTF is a "plain-Jane" text document format that can be opened and read by a variety of operating systems and applications.

.RTL
Run-Time Library file from Norton Utilities/Symantec

.RTM Music module file used with Real Tracker, a digital music composition program

.RTP
Update file found in TurboTax, from Intuit

.RTRACE
Three-dimensional object file used with the RTrace ray tracer

.RTS
Runtime library file used in CA-Realizer, a visual development application from Computer Associates

.RWS
Resource workshop data file used with the Borland C++ programming language

.RWX
Script file found in RenderWare, a graphics application from Criterion Software Ltd.

.RWX
Three-dimensional object (shape) file found in Meme, a commercial virtual reality system from Immersive Systems

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S

.S
Assembler source code file used with the Unix operating system

.S
Source code file used in Scheme, a programming language created by Guy Lewis Steele Jr. and Gerald Jay Sussman that is an offshoot of the Lisp programming language

.S1K
Three-dimensional object file found in SIMNET (Simulator Network), a simulation program for the military from DARPA (Defense Advanced Research Projects Agency) and the U.S. Army

.S3D
File found in three-dimensional graphics programs iGrafx 3D and Simply 3D, both from Micrografx

.S3M
File created with the Scream Tracker 3 digital music composition program

.SAF
Archive file created in the Standard Archive Format, from AMSC (the Advanced Missile Signature Center), a facility in the United States that integrates an archive of signatures and related data with computer systems and other resources necessary for cataloging, retrieving, analyzing, and distributing multiple types of data and media

.SAIF
Data file created in the Spatial Archive Interchange Format, a format for storing geographical data

.SAL
Data file found in SORITEC, an econometric and statistical analysis application from Full Info Software

.SAM
Document file created in AMI Pro, from Lotus

.SAR
Compressed image file created in the SAR compression format

.SAT
ACIS Solid Modeling Objects file used with TurboCAD, a line of computer-aided design products from IMSI

.SAV
Saved file, found in various applications

.SBD
Data definition file used in Superbase, a peer-to-peer client/server database from Superbase Developers

.SBF
Data file used in Superbase, a peer-to-peer client/server database from Superbase Developers

.SBF
Database file found in Superbase 95

.SBI
Instrument file used in Creative Labs' SoundBlaster sound card

.SBK
Bank file found in SoundFont (version 1.X), from E-mu/ENSONIQ

.SBL
Flash object file used with the Shockwave multimedia player from Macromedia

.SBQ
Query definition file used in Superbase, a peer-to-peer client/server database from Superbase Developers

.SBP
Program files for Superbase, a peer-to-peer client/server database

.SBT
Notes file used in Superbase 4 for Windows, a peer-to-peer client/server database from Superbase Developers

.SBV
Form definition file used in Superbase, a peer-to-peer client/server database from Superbase Developers

.SB!
Locking file used with Superbase, a peer-to-peer client/server database from Superbase Developers

.SC
Script file used with Broderbund's Paradox

.SC
Display driver file used in Design FrameWork II, from Cadence Design Systems Inc.

.SC2
File used in Microsoft Schedule+ 7.0, a scheduling application introduced with Windows 95

.SC3
Saved game file for Sim City 3000, from Electronic Arts

.SC4
Level file used in the RollerCoaster Tycoon game from Hasbro

.SCD
Schedule file used in TurboTax, from Quicken

.SCD
File used in Microsoft Schedule+, a scheduling application introduced with Windows 95

.SCD
Data file found in Microsoft Schedule+ 7.0, a scheduling application introduced with Windows 95

.SCENE
Three-dimensional geometric data file

.SCENE
Three-dimensional scene file created in the Sculpt3D program

.SCF
Multimedia show file created with ScoreMaker, a tool that comes with MediaBlitz, an application for multimedia presentations

.SCF
Command file used in the Microsoft Internet Explorer browser

.SCH
Data file used in Microsoft Schedule+, a scheduling application introduced with Windows 95

.SCH
Schematics file found in the Orcad line of applications from Cadence Design Systems

.SCI
SciFAX fax document file

.SCN
Scene data file found in Calgari's trueSpace2

.SCN
Screen file associated with Kermit programs. Kermit is a file transfer protocol developed at Columbia University in 1981. It is also the name of a suite of communication programs from the Kermit Project, also from Columbia University.

.SCN
Three-dimensional object file used with the RTrace ray tracer

.SCO
High score file used in various gaming applications

.SCR
Screensaver file, found in various programs including Microsoft Windows

.SCR
Debug source code file used in DOS Debug

.SCR
Screen snapshot file used with dBASE IV, a database application from dBASE

.SCR
Screen snapshot file found in the ProComm Plus terminal emulation applications from Symantec

.SCR
Screen font file found in Locoscript, a localization and translation service

.SCR
Three-dimensional object file found in the Application Visualization System application, from Advanced Visual Systems, Inc.

.SCT
Screen file used with Microsoft Visual FoxPro database applications

.SCX
Forms file found in the Microsoft FoxPro database program

.SCX
Chart file created in Stanford Chart, a graphing application from Visual Numerics

.SCX
Bit map graphics file used in ColorRIX

.SCY
Security file found in ReaGeniX Programmer, an application from OBP Research used with systems created in the ANSI-C programming language

.SD
Audio file used in Sound Designer

.SD2
Audio file used in Sound Designer II

.SDA
Drawing file created in StarOffice, a suite of business applications from Sun Microsystems

.SDC
Spreadsheet file created in StarOffice, a suite of business applications from Sun Microsystems

.SDD
Presentation file created in StarOffice, a suite of business applications from Sun Microsystems

.SDL
Library file found in SmartDraw for Windows, a business graphics application from Smart Draw Software, Inc.

.SDL
Three-dimensional object file (Scene Description Language format) found in Alias animation programs, from Wavefront/Alias

.SDML
Three-dimensional object file (Spacial Data Modeling Language format) created at the University of Toronto for various applications, including CLRView

.SDP
Data file created in CoCreate SolidDesigner, a CAD application

.SDPC
Data file created in CoCreate SolidDesigner, a CAD application

.SDR
Drawing file found in SmartDraw for Windows, a business graphics application from Smart Draw Software, Inc.

.SDS
Chart file created in StarOffice, a suite of business applications from Sun Microsystems

.SDT
Template file found in SmartDraw for Windows, a business graphics application from Smart Draw Software, Inc.

.SDTS
Three-dimensional object file (Spatial Data Transfer Standard) created by the U.S. Geological Survey. This is the standard for spatial data exchange for U.S. federal government agencies.

.SDV
Semicolon Divided Values file

.SDW
Text file created in StarOffice, a suite of business applications from Sun Microsystems

.SDW
Graphics file used in Lotus WordPro

.SEA
Compressed archive file created in the Macintosh platform

.SEA
Self-extracting file used with StuffIt compression/decompression programs, from Aladdin Systems

.SED
Screen editor script file. A script is a series of command that can be executed at the touch of a button.

.SEL
Selection file used in PaintShop Pro, from Jasc Software

.SEP
A printer separator page file found in various applications

.SES
Session file found in Cool Edit, a digital audio music editor program from Syntrillium Software Corp.

.SET
Voice set file used in applications from Quartet Software Ltd., a British company that makes programs for the health care industry

.SF2
Bank file found in Creative Labs' SoundBlaster sound card; the file is in the SoundFont 2.0 format, a downloadable sound file format created by E-mu Systems

.SFD
Data file used with Audio FX3 SoundStage, a virtual recording studio and DirectX plug-in from Cakewalk

.SFF
Three-dimensional scene file created in the Simple File Format and found in the RTrace ray tracer

.SFI
Information file used with Audio FX3 SoundStage, a virtual recording studio and DirectX plug-in from Cakewalk

.SFI
Printer font file used with VENTURA Publisher, from Corel

.SFI
Printer font file used with Corel VENTURA Publishing

.SFK
Sound file found in applications from Sonic Foundry Media Software, a maker of audio and video programs for professionals

.SFL
A PCL 4 (page description language) bit map font file from Hewlett-Packard's Intellifont

.SFL
Printer font file used with Corel VENTURA Publishing

.SFP
Printer font file used with Corel VENTURA Publishing

.SFP
A PCL (page description language) bit map font file from Hewlett-Packard's Intellifont

.SFR
Sample resource file found in applications from Sonic Foundry Media Software, a maker of audio and video programs for professionals

.SFS
A PCL 5 (page description language) scalable font file from Hewlett-Packard's Intellifont 5, a scalable font technology

.SFS
Frame file used in StarOffice, a suite of business applications from Sun Microsystems

.SFT
Screen font file used in ChiWriter, a scientific word processing application from Horstmann Software Development Corp.

.SFX
Self-extracting archive file used in RAR, a family of archiving programs from Softronic Oy, a Finnish software company

.SG1
Graphics file created with Stanford Graphics, from Visual Numerics

.SGF
Word document (with graphics) file created in StarWriter, the word processing application in the StarOffice suite of business applications from Sun Microsystems

.SGF
Graphics file found in Sonique, a line of Web-based media and MP3 players

.SGF
Three-dimensional object file (Standard Graphics Format) created by the U.S. Naval Academy, used to store geometric data

.SGL
Master document used in StarOffice, a suite of business applications from Sun Microsystems

.SGML
File created in the Standard Generalized Markup Language, an international standard for electronic document exchange and the basis for the HTML and XML languages

.SGO
Three-dimensional object file (Silicon Graphics Object format) used in the IRIS Showcase application, from Silicon Graphics

.SGP
Statistics file used in STATGRAPHICS Plus, a family of data analysis applications from Timberlake Consultants, a U.K.-based company

.SH
Shell script file used with the Unix operating system

.SH3
Show file used with Harvard Graphics Chart XL 3.0

.SHADE
Three-dimensional object file used in the RayDream animation program, from Ray Dream, Inc.

.SHADE
Three-dimensional object file found in Rayshade, a freeware ray tracer for the Unix operating system created by Craig Kolb

.SHG
Bit map graphics file found in Web Hotspots Imagemapper, an image map editor from 1automata

.SHK
Compressed archive file created by ShrinkIt, a compression utility for the Apple II computer

.SHK
Compressed archive file created by compression utility Arthurian Shrink Archiver

.SHM
Shell macro file used in the Corel WordPerfect for Windows library

.SHP
Shape file for text fonts used with AutoCAD, general design software from Autodesk

.SHTML
An HTML (Hypertext Markup Language) file that contains SSIs (server side includes), which are commands that execute CGI programs

.SHW
Presentation file created in CorelSHOW

.SHW
Presentation file used in Harvard Graphics for Windows 2.0

.SHW
Slide show file used in WordPerfect for Windows, from Corel

.SHX
Shape entities file used with AutoCAD, general design software from Autodesk

.SHX
Shapefile spatial index file used in ArcView, a line of mapping and GIS applications from RockWare, Inc.

.SIF
Setup installation file used in Microsoft Windows NT operating system

.SIG
Signature file created in the PopMail e-mail application from PopMail.com

.SIK
Backup file created in Microsoft Word for Windows

.SIT
Compressed archive file for Macintosh computers created with StuffIt, a line of compression programs from Aladdin Systems

.SIZ
Configuration file used in Oracle 7, a database application from Oracle

.SKF
Drawing file created in AutoSketch, a drawing tool from Autodesk, Inc.

.SKL
Resource file used in the Macromedia Director multimedia authoring program

.SL
S-Lang language source code file

.SLB
Slide library file found in AutoCAD, general design software from Autodesk

.SLD
Slide file used in AutoCAD, general design software from Autodesk

.SLI
Slide file used in MAGICorp Slide Service

.SLL
Sound data file found in various applications

.SLW
Symbol library file found in TurboCAD, a line of computer-aided design products from IMSI

.SM
Source code file used in the Smalltalk programming language

.SM
Mail list file found in SoftSpoken Mailer

.SM
Script file used in ScriptMaker, a series of free script-writing applications from TaFWeb Software

.SM
Text file used in Samna Word, an early word processing application from Samna Corp.

.SM3
Symbol file found in DataCAD, a business-to-business architecture application from DataCAD LLC

.SMD
Mail file created in StarOffice, a suite of business applications from Sun Microsystems

.SMD
Mail file found in StarOffice, a suite of business applications from Sun Microsystems

.SMF
Fax document created in SmartFax, from RingCentral

.SMK
Image file used in Deer's Revenge, a simulation sporting game from Valu-Soft

.SMM
Macro file found in Ami Pro, an older word-processing application from Lotus

.SMM
Macro file used in Ami Pro from Lotus

.SMP
Gallery files that can be imported into and exported from Ulead Systems' PhotoImpact (versions 4–7)

.SMP
Sample file used with AdLib Gold, a sound card from Synrise/Adlib Multimedia Inc.

.SMT
Text file created in Smart Ware II

.SMT
SmartObject file used in IconAuthor, a family of multimedia authoring applications from PPS Technology, an Australian company

.SNDR
Sound file used in Sounder, an application for creating musical environments for the PC from Perpetual Music Inc.

.SNDT
Audio file found in the shareware application Sndtool

.SNG
MIDI (the musical instrument digital interface protocol) song file used in Midisoft Studio

.SNO
Source code file found in SNOBOL4, a programming language from Catspaw, Inc.

.SO
Shared library file used in the Unix operating system, similar to a dynamic link library file (.DLL) file used in the Windows operating system

.SOFT
Three-dimensional object file found in the Softimage/3D modeling and animation program

.SOL
Three-dimensional object file used with the Clip3D program for Windows, from Enabling Technologies

.SON
Song file used in Creative Labs' SoundBlaster Studio II sound card

.SOU
Sound file used in Creative Labs' SoundBlaster Studio sound card

.SP4
Saved game file created in the RollerCoaster Tycoon gaming application from Hasbro Interactive

.SPC
Temporary file created in WordPerfect for Windows, from Corel

.SPC
Program file found in MultiPlan, an early spreadsheet application from Microsoft

.SPD
Scalable font file used in Speedo, from Bitstream Inc.

.SPF
Three-dimensional object file (Simple Polygon Format), created at the U.S. Naval Academy and used to store geometric data

.SPI
Graphics file used with Siemens scanners

.SPL
Object file used with Macromedia's Flash and Shockwave players

.SPL
Compressed file created by the SPLINT archive utility from Simtel

.SPM
Data file found in Corel WordPerfect for Windows

.SPR
Screen program file created in the Visual FoxPro database application from Microsoft

.SPT
Source code file used in SPITBOL, a 32-bit "dialect" of the programming language SNOBOL4, from Catspaw, Inc.

.SPU
Picture file found in Spectrum 512, an older graphics program created for used on the Atari ST computer

.SPW
Worksheet file used in SigmaPlot, a graphing application from SPSS Science

.SPX
Compiled screen program used in the Visual FoxPro database application from Microsoft

.SQC
Common code file associated with the Structured Query Language; SQL is the standard, IBM-created database sub-language that is used to request information from a database

.SQL
Any of various files created when the Structured Query Language, a database sub-language, runs a query for information in the database

.SQP
Query file created when an audio search is conducted in Sonique, a line of Web-based media and MP3 players

.SQR
Program file used with the Structured Query Language, a database sub-language created by IBM

.SQZ
Compressed file created by the compression utility Squeeze, from Sorenson Media

.SRF (see .RAS)
Sun Raster graphics file, from Sun Microsystems

.SRP
Script file used in QuickLink, a fax/mobile phone application from Smith Micro Software

.SRZ
Source file used in DataFlex, a Data Access Corp. program for developing database applications

.SSA
Video file found in Sub Station Alpha, a freeware video subtitling program for the Windows operating system

.ST
Source code file associated with Little Smalltalk, an open version of the Smalltalk programming language

.ST
Instrument library file used with Scream Tracker, a line of applications for composing digital musi

.ST
Stamp file used in NeoPaint for Windows, an image-editing application from NeoSoft Corp.

.ST4
Style template file used in Harvard Graphics for Windows 7.0

.STA
Saved state file created in Reflection 4.0, a Web-based terminal emulation program from WRQ

.STD
State transition diagram graphics file found in programs from Prosa, an Italian freeware developer

.STD
Standard script file used in the Locoscript localization and translation service

.STEP
Three-dimensional modeling file created in the Standard for the Exchange of Product Mode Data format and used with the Trispectives and UniGraphics applications

.STF
Compressed archive file created by the ShrinkToFit compression utility

.STL
Three-dimensional object file (Stereolithography Interface Format, binary) used in the SLA CAD application, from 3D Systems

.STLA
Three-dimensional object file (Stereolithography Interface Format, ASCII) used in the SLA CAD application, from 3D Systems

.STM
An HTML (hypertext markup language) file that contains SSIs (Server Side Includes), which are commands that execute CGI programs

.STM
State transition diagram model file used in programs from Prosa, an Italian freeware developer

.STM
Music file used with Scream Tracker digital music composition program

.STP
Three-dimensional modeling file created in the Standard for the Exchange of Product Mode Data format and used with the Trispectives and UniGraphics applications

.STQ
Text file created in Statistica, a line of statistical data analysis programs from HALLoGRAM Publishing

.STR
Structure list file used in dBASE IV, a database application from dBASE Inc.

.STS
Song file created with Scream Tracker, a line of applications for composing digital music

.STS
Project status information file created with the Microsoft C and C++ programming languages

.STT
Streets & Map template file found in Microsoft Works Suite 2002

.STW
Data file found in SmartTerm for Windows, a terminal emulation program

.STX
Electronic book file found in SmarText, an e-book reader from Lotus Development Corp.

.STY
Style template file, used in various text and graphics applications, including Harvard Graphics and VENTURA Publisher from Corel

.SUI
Library file found in SUIT, the Simple User Interface Toolkit

.SUM
Summary file associated with various applications

.SUN (see .RAS)
Raster graphics file, from Sun Microsystems

.SUP
Supplementary dictionary file used with Corel's WordPerfect for Windows

.SV
Three-dimensional object file (SuperViewer format) used with the I3DM database modeling program and IRIS Performer application, from Silicon Graphics

.SVD
Autosave document file found in Microsoft Word and Corel's WordPerfect for Windows

.SVF
Simple Vector Format two-dimensional image file found in MicroStation, from Bentley Systems

.SVG
Scalable vector graphics file found in various Adobe graphics applications

.SVG
Autosave file used with the Corel WordPerfect for Windows glossary

.SVP
Graphics file found in Sonique, a line of Web-based media and MP3 players

.SWA
Shockwave audio file used with the Macromedia Director multimedia authoring program

.SWF
File associated with Flash 5.0, an animated Web content designer application from Macromedia

.SWF
Object file used with Macromedia's Flash and Shockwave players

.SWG
Packet file found in the SWAG Reader application. SWAG (Sourceware Archive Group) is a collection of source code and program examples for the PASCAL programming language.

.SWP
Swap file, which is a hidden file used in a Microsoft Windows environment to move data in and out of memory

.SWP
Swap file used with DataCAD, a business-to-business architecture application from DataCAD LLC

.SYD
Backup file containing startup files for QEMM, a memory-boosting family of programs from Symantec

.SYM
Precompiled header file associated with the Borland C++ programming language

.SYN
Synonym file used in Microsoft Word

.SYS
Data file found in Sygraph, a graphics program from SPSS

.SYS
Data file used in SYSTAT, a statistical and analytical graphics application from HALLoGRAM Publishing

.SYS
System file found on various operating systems

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T

.T
Source file found in TADS (Text Adventure Development System), a freeware gaming system

.T
Tester symbol file found in ReaGeniX Programmer, an application from OBP Research used with systems created in the ANSI-C programming language

.T2T
File used in Sonata CAD, a modeling application

.T3D
Three-dimensional object file (3D Data Description format) found in the Imagine and Turbo Silver ray tracer programs, from Impulse

.T32
A Lotus 1-2-3 file used in SmartSuite

.TAB
Script file used in SmartSuite, from Lotus

.TAG
Query tag name file used in DataFlex, a Data Access Corp. program for developing database applications

.TAH
Turbo assembler help file created with the Borland C++ programming language

.TAL
Text illustration file created in TypeAlign, an older illustration program from Adobe

.TAR
Compressed Unix tape archive file

.TAX
File found in TurboTax, from Intuit

.TAZ
Tape archive file for the Unix operating system compressed in the GZIP compression utility

.TB1
Font file used with the Borland Turbo C programming language

.TB2
Font file used with the Borland Turbo C programming language

.TBF
Fax document created in TurboFax, a fax application for the OpenStep technology from Apple Computer

.TBK
Memo backup file found in the dBASE IV database program from dBASE

.TBK
File used in Asymetrix ToolBook, a content authoring application from Click2learn, Inc.

.TBL
Import mapping table used in Adobe Pagemaker

.TBX
Table file used in Project Scheduler 4.0, a business application from EnterpriseSoft

.TC
Configuration file used with the Borland C++ programming language

.TC
Configuration file used in the Turbo C programming language

.TCH
Turbo C help file created with the Borland C++ programming language

.TCL
Script file used in the Tcl/Tk programming language/graphics toolkit

.TCT
Template file found in TurboCAD, a line of computer-aided design products from IMSI

.TCW
Drawing file created in TurboCAD, a line of computer-aided design products from IMSI

.TCX
ASCII (text) file used in TurboCAD, a line of computer-aided design products from IMSI

.TD
Configuration file found in Turbo Debugger for Windows, an application that corrects programming bugs. Turbo Debugger, from Borland, was written for the C++ programming language.

.TD0
Disk image file created in TeleDisk, a diskette compression program from New Technologies Inc.

.TD4
Saved track design file created in the RollerCoaster Tycoon gaming application from Hasbro Interactive

.TDB
Database file created in ThumbsPlus, a line of image database / graphics editing applications from Cerious Software

.TDDD
Three-dimensional object file (3D Data Description format) found in the Imagine and Turbo Silver ray tracer programs, from Impulse

.TDF
Font file found in TheDraw, a collection of Web-based, downloadable fonts

.TDF
Typeface definition file for Speedo fonts

.TDH (see .TD)
Help file found in Turbo Debugger, from Borland

.TDK (see .TD)
Keyboard record file found in Turbo Debugger, from Borland

.TDS
Symbol table file used in Turbo Debugger, an application that corrects programming bugs. Turbo Debugger, from Borland, was written for the C++ programming language.

.TDW
Configuration file used in Turbo Debugger for Windows, from Borland

.TEF
Fax document file found in the Relisys TEFAX faxing program

.TEM
Input template file used in IconAuthor, a family of multimedia authoring applications from PPS Technology, an Australian company

.TEX
Text file created in Scientific Word, a series of word processing applications for the creation of mathematical, scientific, and technical documents from HALLoGRAM Publishing

.TEXT
Plain text (ASCII) file, similar to those with the .TXT extension, that works with a variety of word processing applications, such as Microsoft Word

.TF
Configuration file used with Turbo Profiler, from Borland

.TFC
Catalog file created in Tobi's Floppy Disk Cataloguer

.TFH
Help file used with Turbo Profiler, from Borland

.TFM
Form file created in Form Tool Gold

.TFM
Font metric file used in TeX, a computer language created by Donald Knuth for use in typesetting, especially math

.TFS
Statistic file used with Turbo Profiler, from Borland

.TG1
Project file found in On Target, a real estate analysis program from Advantage Software LLC

.TGA
Truevision Targa graphics file developed by Truevision, used in various high-end paint and CAD applications

.TGV
Video file found in the Need for Speed series of computer games from Electronic Arts

.TGZ
Compressed file created with PKZIP, from PKWare, or GZIP, a compression utility for the Unix operating system

.THEME
Desktop theme file used in Microsoft Windows 95/98 operating systems

.THM
Theme file used in DrawPlus, graphics applications from Serif

.THM
Database file found in Microsoft Clip Art Gallery

.THP
File used in TurboTax, from Intuit

.THS
Thesaurus dictionary file used in Corel WordPerfect for Windows

.TIF
TIFF(Tagged Image File Format) file. Created as a way of saving scanned images, TIFF is a method of storing bit-mapped images on both PCs and Macintosh computers.

.TIM
Texture/image file used in PlayStation applications

.TIT
Raw file generated by Xtrack audio suite (latest version is 4.1), from Digigram

.TJF
Backup file found in VAXTPU (VAX Text Processing Utility), a program that modifies and creates text-processing applications

.TLB
Text library file used in VAX computers, an old model of PCs from Digital

.TLB
Type library file created by the Microsoft Visual C++ programming language

.TLIST
Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application

.TLP
Timeline file found in Microsoft Project, a scheduling application that also is part of the Microsoft Office suite

.TLP
Project timeline file used with Microsoft Project, a project management application in Office 2000

.TLX
Data file found in Trellis, a Web site publishing platform from Trellis Corp.

.TMESH
Three-dimensional object file found in the Echo scanning program, from Cyberware

.TMF
Tagged font metric file used in WordPerfect for Windows, from Corel

.TMP
Temporary file used in Microsoft Windows operating systems

.TMS
Script file used in Telemate, a call accounting application from Telemate.Net Software, Inc.

.TNPOLY
Three-dimensional object file created in the Triangulated Polygon format

.TOC
Table of Contents file used in Eudora Mailbox family of e-mail applications

.TOL
Image file found in Photo Enhancer, an application for digital cameras from Kodak

.TOS
A self-extracting archive file associated with Atari ST, an older line of PCs

.TP
Configuration file found in Turbo Pascal, from Borland

.TP3
Template file used in Harvard Graphics Presentation 3.0

.TP4
Saved picture file created in the RollerCoaster Tycoon gaming application from Hasbro Interactive

.TPB
PCL Soft font backup file found in HiJaak, a line of graphics programs from HALLoGRAM Publishing; PCL is a metafile for the HP LaserJet II

.TPF
PCL Soft font file (a metafile) found in HiJaak, a line of graphics programs from HALLoGRAM Publishing

.TPH
Help file used in Turbo Pascal, from Borland

.TPL
Template file, found in various applications, including Harvard Graphics, Canvas 7 (Deneba), and Cakewalk Audio applications

.TPL
Template file used in Ulead Systems' Photo Express (versions 1.1, 3, and 4) and iPhotoPlus applications

.TPL
Work file template found in all Cakewalk programs, which are computer-based recording applications

.TPL
Encrypted lesson file found in programs from TutorPro, a line of interactive e-learning applications

.TPOLY
Three-dimensional object file created in the Triangulated Polygon format

.TPP
Project file used in Teleport Pro, a Web spider application from Tennyson Maxwell Information Systems, Inc.

.TPP
Protected mode units file found in Turbo Pascal 7.0, an object-oriented programming application from Borland

.TPU
Command file used in VAXTPU (VAX Text Processing Utility), a program that modifies and creates text-processing applications

.TPV
Packed graphics file used in programs from TutorPro, a line of interactive e-learning applications

.TPW
Packed wave file used in programs from TutorPro, a line of interactive e-learning applications

.TPX
Template Extension file used in Ulead Systems' Photo Express (versions 3 and 4)

.TPZ
Compressed archive file created by the GNUzip (gzip) compression program, written by Jean-loup Gailly and Mark Adler

.TRC
Debug support file used in Power CTrace, a debugging application for the C programming language from Mix Software, Inc.

.TRI
Three-dimensional object file (External Object Representation format), created by the Royal Institute of Technology

.TRK
Script file associated with Kermit programs. Kermit is a file transfer protocol developed at Columbia University in 1981. It is also the name of a suite of communication programs from the Kermit Project, also from Columbia University.

.TRM
Terminal settings file found in Microsoft Windows 3.x operating systems. Terminal is an applet that enables communication between computers.

.TRN
File found in Adobe Pagemaker, a desktop publishing application

.TRN
Translation support file used in Quattro Pro, from Corel

.TRP
File generated by Tripmaker, a mapping application from Rand McNally

.TRT
Report template file used in Team Sports Scheduling System, an application from Galactix Software (formerly TC Software) that enables round-robin sports scheduling

.TSS (see .TRT)
Project file used in Team Sports Scheduling System

.TST
Printer test file used in WordPerfect for Windows, a word-processing program from Corel

.TSX (see .TRT)
XML project file used in Team Sports Scheduling System

.TTF
Generic TrueType font file used in applications for Windows and Macintosh computers. A TrueType font can be printed or displayed on screen at any size.

.TTK
Translation toolkit file used in Catalyst, an internally used program for translating software and documentation from Corel

.TUT / .TUV
Tutorial file, used in various applications

.TV
Lotus 1-2-3 map data file found in SmartSuite

.TVC
Lotus 1-2-3 map data file found in SmartSuite

.TVF
Table view settings file used with the dBASE IV database program from dBASE

.TVP
Three-dimensional object file (Spatial Data Transfer Standard) created by the U.S. Geological Survey. This is the standard for spatial data exchange for U.S. federal government agencies.

.TWF

Data file found in TabWorks, an application for organizing the Windows desktop environment from Citadel

.TWW
Template file used in TagWrite, a program from the ZANDAR Corporation that converts "tagged" documents (ASCII documents with embedded tags) from one tagged form to another, or to Rich Text Format

.TXB
Encoded briefing file used in the Descent game from Descent Network Team

.TXF
Compressed archive file created with Freeze, an older compression program

.TXI
Support file created with TeX, a computer language created by Donald Knuth for use in typesetting, especially math

.TXT
Text file used with various word processing applications, including Microsoft Word

.TYM
Time stamp file found in Adobe PageMaker 4.0

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U

.UAA
Saved project file made in Ulead Systems' Animation Applet (versions 1 and 2)

.UC2
Compressed archive file created by UltraCompressor II

.UCN
New compressed archive created by UltraCompressor II

.UDF
Unique database file found in the Microsoft Windows NT operating system

.UDF
Image filter file used in Aldus PhotoStyler, an image editing application

.UE2
Encrypted archive file created with UltraCompressor II, an archiving program from the Dutch company AIPNL

.UES
Ulead Explorer Slideshow file, found in Ulead Systems' Photo Explorer (versions 6–7)

.UFO
Ulead File Object, found in Ulead Systems' PhotoImpact (versions 4–7)

.UFO
Object file found in applications from Ulead Systems, Inc., which makes video, animation, and image-editing programs

.UG
Drawing file created in AutoCAD, general design software from Autodesk

.UGA
Saved project file generated in Ulead Systems' GIF Animator 5

.UHS
Binary file used with the Universal Hint System, a Web site of downloadable hints for the gaming industry that can be viewed by the UHS Reader

.UI
Source code file found in the Geoworks UI Compiler

.UIH
Header file found in the Geoworks UI Compiler

.UIS
Image Sequence file used in Ulead Systems' MediaStudio Pro (versions 6.0 and 6.5)

.ULAW
Generic audio file used with various audio applications

.ULD
Uploaded file information used with the ProComm Plus terminal emulation applications from Symantec

.ULT
Music module (MOD) created in the UltraTracker digital music format

.UMA
Saved project file made in Ulead Systems' Menu Applet 1.0

.UMB
Backup archive file created by MemMaker, an application that optimizes memory in DOS(disk operating system) computers

.UNC
Three-dimensional object file created at the University of North Carolina and used to store geometric data in architectural programs

.UNI
Data file used in Forecast Pro, a sales forecasting program from Business Forecast Systems

.UNX
Text file used in the Unix operating system

.UOL
Ulead Object Library file, found in Ulead Systems' PhotoImpact (versions 4–7)

.UPD
Updated program data file found in the dBASE database program from dBASE

.UPD
Update file found in dBase database programs

.UPI
Program file in Photo Impact, an image-editing application from Ulead Systems, Inc.

.UPJ
Project file used in Ulead Systems, Inc., applications

.UPJ
Photo Joiner file used in Ulead Systems' COOL 360 application

.UPO
Compiled updated data file used in the dBASE database program from dBASE

.UPX
Photo Extension saved project file generated by Ulead Systems' Photo Express (version 1.1, 3, and 4) and iPhotoPlus programs

.UPX
Saved image file used in Photo Express, an image-editing application from Ulead Systems, Inc.

.USP
Printer font file found in Adobe Pagemaker

.URF
Universal radar file format found in Radar ViewPoint, a radar data analysis application from Airways Technology

.USR
User database file used with the ProComm Plus terminal emulation applications from Symantec

.USR
Audit trail file used with Pro/ENGINEER, a 3D engineering program from PTC

.USR
User database file created with the Turbo C++ programming language

.UU
File compressed in uuencode, a Unix-originated protocol for transferring files between various platforms

.UVR
File used in COOL 360, a viewing tool from Ulead Systems, Inc.

.UWF
Wave audio file created in the UltraTracker digital music format

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V

.V
Main image input file used in Vivid 2.0, an image manipulation (ray tracer) utility written by Stephen B. Coy

.V
Consistency check support file found in ReaGeniX Programmer, an application from OBP Research used with systems created in the ANSI-C programming language

.V8
Audio file found in the 8-bit Covox Voice Master Jr., a hardware add-on for old Atari PCs

.VAL
Validity check file generated in Paradox for Windows, a database application from Borland

.VAL
Asset management document created in OmniValue, a financial management shareware program from Milliplex

.VAL
Values list object file found in dBASE Application Generator, from dBASE Inc.

.VAR
Variable file used in IconAuthor, a family of multimedia authoring applications from PPS Technology, an Australian company

.VBD
An ActiveX file written in VBScript. ActiveX is technology developed by Microsoft that governs how programs share information.

.VBE
Encoded script file written in the VBScript scripting language

.VBP
Project file used in Microsoft Visual Basic development applications

.VBR
Remote automated registration file used in Microsoft Visual Basic, development software for business applications

.VBS
Script file used in Microsoft Visual Basic development applications

.VBW
Workspace file used in Microsoft Visual Basic development applications

.VC
Spreadsheet file used in VisiCalc, an early spreadsheet application from Software Arts, Inc.

.VC
Color definitions file found in Vivid 2.0, an image manipulation (ray tracer) utility written by Stephen B. Coy

.VCA
Three-dimensional object file used in the VRT ray tracer program, from SuperScape

.VCE
Unformatted voice file used in Cool Edit, a digital audio music editor program from Syntrillium Software Corp.

.VCE
Unformatted voice file found in programs by NMS Communications, makers of wireless voice systems and wired network voice programs

.VCF
File associated with vCard, a specification, controlled by the Internet Mail Consortium, for information exchange using electronic business and personal cards

.VCT
A Microsoft Outlook vCalendar file. vCalendar is a standard format for the electronic exchange of scheduling information.

.VCT
Class library file used in the Microsoft FoxPro database application

.VCW
Visual workbench information file created in the Microsoft visual C++ programming language

.VCX
Class library file used in the Microsoft FoxPro database application

.VDA
Targa bit map graphics file from Truevision Inc.

.VDR
Drawing file found in ComputerEasy Draw

.VDX
XML (extensible markup language) drawing file created in Microsoft Visio 2002

.VECT
Three-dimensional object file (Object Oriented Graphics Library format) developed at the University of Minnesota's Geometry Center for use with the Geomview application

.VEL
Three-dimensional drawing file used in professional CAD applications from Ashler-Vellum

.VEW
View file used in Lotus Approach

.VFL
Clip-art file found in the PrintMaster Gold family of image gallery software, from The Learning Co.

.VGA
Video Graphics Array display font or display driver file. Developed by IBM, VGA is a display standard for monitors.

.VGR
Graphics file used in Corel VENTURA Publisher

.VI
Graphics file used with video capture boards from the Jovian Logic Corp.

.VIC
Graphics file found in VICAR (Video Image Communication And Retrieval), an image- processing software system created in 1966 to digitally process multi-dimensional imaging data from the Jet Propulsion Laboratory's unmanned planetary spacecraft. Today it used for other applications, such as cartography, astronomy, and geological exploration.

.VID
Screen device driver file found in the Microsoft Word word-procession program. A device driver allows hardware peripherals, such as a monitor, to communicate with a PC.

.VID
Three-dimensional scene file used in the VideoScape application

.VIV
Streaming video file used with VivoActive, a video player from Vivo Software, Inc.

.VIZ
Three-dimensional object file created in dVS, from Division Ltd.

.VLB
Three-dimensional object file found in Vivid 2.0, an image manipulation (ray tracer) utility written by Stephen B. Coy

.VLB
Library file used in Corel VENTURA Publisher

.VLM
Drafting program file created in Vellum, a professional-level CAD application from Ashler-Vellum

.VM
Virtual memory file found in products from Geoworks, makers of software for mobile and handheld devices

.VMC
Virtual memory configuration file found in Adobe Acrobat, a program that converts documents to Adobe Portable Document Format files

.VMF
Audio file found in FaxWorks, a business fax services application from SNET

.VML
Vector markup language file used in applications of the Microsoft Office 2000 suite

.VO
Object definition file found in Vivid 2.0, an image manipulation (ray tracer) utility written by Stephen B. Coy

.VOX
Formatted voice file found in programs by NMS Communications, makers of wireless voice systems and wired network voice programs

.VP
Publication file created in Corel VENTURA Publisher

.VPS
Project file generated by Ulead Systems' VideoStudio (versions 3–5)

.VRF
Configuration file used in Oracle 7, a database program from Oracle Corp.

.VRM
Overlay file found in Quattro Pro, from Corel

.VRML
Three-dimensional object file (Virtual Reality Modeling Language), created by Silicon Graphics. VRML is a platform-independent language used to create virtual reality scene design.

.VRML
Proposed file format for the Labyrinth Virtual Reality Markup Language format

.VRP
Project file created in VXRexx, a visual development environment for the OS/2 operating system (IBM) from Watcom Software

.VRS
Graphics driver file used in Corel WordPerfect

.VRT
Three-dimensional object file used in the VRT ray tracer program, from SuperScape

.VS
Surface definition file found in Vivid 2.0, an image manipulation (ray tracer) utility written by Stephen B. Coy

.VSD
Drawing file created in Microsoft Visio 2002

.VSL
Download list file found in GetRight, an Internet download manager application from Headlight Software

.VSM
Simulation model file created in VisSim, a family of simulation and embedded system design programs from Visual Solutions, Inc.

.VSP
Data print file created in ScheduleSoft, a line of scheduling applications from ScheduleSoft Corp.

.VSS
Stencil file created in Microsoft Visio 2002

.VST
Template file created in Microsoft Visio 2002

.VST
Bit map graphics file used in Truevision Vista, from Truevision Inc.

.VSX
XML stencil file created in Microsoft Visio 2002

.VTX
XML template file created in Microsoft Visio 2002

.VTX
Three-dimensional object file created in dVS, from Division Ltd.

.VUE
View file used in dBASE IV, a database application from dBASE Inc.

.VUE
View file found in the Microsoft FoxPro database application

.VW
Text file created in Volkswriter, an early ASCII-based word processor developed by Lifetree Software

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W

.WAB
Address Book file used in the Microsoft Outlook e-mail application

.WAD
Game information (such as player level) file found in the DOOM game

.WAL
Texture file used in the Quake 2 gaming application from id Software

.WAS
Script source code file used with ProComm Plus, a security application from Symantec

.WAV
Wave audio file, a standard PC audio file format developed by Microsoft.

.WAX
Compiled script file used with ProComm Plus, a security application from Symantec

.WB1
Notebook file found in Corel's QuattroPro for Windows

.WB2
Spreadsheet file found in Corel's QuattroPro for Windows

.WB3
Text file found in Corel's Quattro Pro for Windows

.WBC
Image file used in Webshots Desktop, a downloadable wallpaper and screensaver program on the Web

.WBF
Batch file found in Microsoft Windows operating systems (versions 9.X)

.WBK
Backup file used in Microsoft Word and Corel WordPerfect

.WBL
Upload file used in Webload II, a Web page uploading application from Freedom2 Ltd.

.WBR
File found in Wordbar, a writing support application from Crick Software, a British company specializing in literacy software

.WBT
Template found in Wordbar, a writing support application from Crick Software, a British company specializing in literacy software

.WCM
Data transmission file used in Microsoft Works

.WCM
Macro file found in Corel WordPerfect

.WD2
Database file created in Info Select, a line of personal information management applications from Micro Logic Corp.

.WDB
Database file used in Microsoft Works

.WEB
Web document created in XARA, a vector drawing application formerly owned by Corel but now owned by Xara, Ltd.

.WFB
Bank file used in WaveFront, from Voyetra Turtle Beach, makers of digital audio products

.WFD
Drum set file used in WaveFront, from Voyetra Turtle Beach, makers of digital audio products

.WFD
Audio waveform file found in Metratek WaveForm Manager Pro, an oscilloscope waveform program from BLI Inc.

.WFL
Flowchart file created in WinFlow, a line of flowchart applications for Windows from FlowCharts.com

.WFP
Program file found in WaveFront, from Voyetra Turtle Beach, makers of digital audio products

.WG1
Worksheet file used in Lotus 1-2-3

.WG2
Worksheet file used in Lotus 1-2-3

.WGP
Data file found in Wild Board Games, a suite of five games for the PC from Corel Corp.

.WID
Width table used in VENTURA Publisher, a graphics application from Corel Corp.

.WIN
Window preference file used in Pro/ENGINEER, a 3D engineering program from PTC

.WIN
Window file associated with Microsoft Visual FoxPro database application

.WIN
Window file used in dBase database programs

.WIZ
Wizard file found in Microsoft applications, including Word and Publisher

.WK1
Spreadsheet file used in Lotus 1-2-3 (versions 1 and 2)

.WK3
Spreadsheet file used in Lotus 1-2-3 (version 3)

.WK4
Spreadsheet file used in Lotus 1-2-3 (version 4)

.WKB
Document file found in Corel WordPerfect applications

.WKE
Spreadsheet file found in Lotus 1-2-3 (educational version)

.WKQ
Spreadsheet file used in Corel's Quattro Pro

.WKS
Spreadsheet file associated with Lotus Symphony 1.0, the spreadsheet application that replaced Lotus 1-2-3

.WKS
Document file created in the Microsoft Works word processor

.WKS
Workspace file used in the XLISP programming language

.WLD
Three-dimensional object file (WorLD format) found in the REND386, VR386, AVRIL and Gossamer graphics applications

.WLF
Upload file used in Upload I, a Web page uploading application from Freedom2 Ltd.

.WLK
Graphics file found in Walkthrough, a three-dimensional room and space design program from Virtus Entertainment Corp.

.WLL
Word add-in file found in Microsoft Works Suite 2002

.WMC
Text file created in WordMARC, an older word-processing application

.WMC
Macro file used in WordPerfect for Windows, from Corel Corp.

.WMF
Metafile (a type of graphics file) found in Microsoft Windows operating systems and Windows-based programs

.WN
Text file created in NeXt WriteNow, an older word-processing application

.WOC
Organization chart file used in Microsoft Windows OrgChart

.WP
Document file used in Corel WordPerfect applications

.WPD
Document created in Corel WordPerfect (version 6.1 or higher)

.WPF
Text file used in Corel WordPerfect applications

.WPF
Fax document created in the WorldPort faxing application

.WPG
Graphics file used in Corel WordPerfect applications

.WPM
Macro file found in the Microsoft Word word-processing program

.WPS
Text document created in the Microsoft Works word processor

.WPT
Template file used in Corel WordPerfect applications

.WPT
Works template file found in Microsoft Works Suite 2002

.WPW
Document created in PerfectWorks for Windows (formerly WordPerfect Works) from Novell, Inc.

.WQ!
Compressed spreadsheet file found in Corel Quattro Pro

.WQ1
Spreadsheet file used in Corel Quattro Pro

.WQ2
Spreadsheet file used in Corel Quattro Pro

.WRD
Template file found in Charisma, a graphics application from Micrografix

.WRG
Document created in programs from ReGet Software, makers of Web site downloading and uploading software

.WRI
Document generated by Microsoft Write

.WRK
Work file found in all Cakewalk programs, which are computer-based recording applications

.WRK
Spreadsheet file used in Symphony 1.0, from Lotus

.WRL
Three-dimensional object file (Virtual Reality Modeling Language), created by Silicon Graphics. VRML is a platform-independent language used to create virtual reality scene design.

.WS
Text file created in WordStar, an older word-processing application

.WS2
Document created in WordStar (version 2), a word processing application

.WSB
Works portfolio file found in Microsoft Works Suite 2002

.WSD
Document created in WordStar for Windows 2000

.WSP
Workspace file found in FORTRAN PowerStation, a line of compiler applications from Microsoft

.WST
Document created in WordStar for Windows, an older family of word-processing programs

.WWL
Add-in file found in the Microsoft Word family of word-processing programs

.WWP
User information (personal data) file created in Broderbund WillWriter

.WX
Saved weather file found in Microsoft Flight Simulator 2002

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X

.X
Source code file used in LEX (lexical analyzer generator), a compiler for programming languages. A compiler interprets a high-end programming language into a basic language computers understand.

.X3D
Three-dimensional object file found in the xdart and x3d (version 2.0) rendering programs

.XAR
Drawing file created in XARA, a vector drawing application formerly owned by Corel but now owned by Xara, Ltd.

.XDL
File created in XML Schema, a version of the Extensible Markup Language (XML, the protocol for creating Web documents)

.XFN
Printer font file used with Xerox printers

.XFN
Printer font file used in Corel VENTURA Publisher

.XFT
Printer font file found in ChiWriter, a scientific word processing application from Horstmann Software Development Corp.

.XHTML
File created in the Extensible HyperText Markup Language, based on the Extensible Markup Language (XML) but also an outgrowth of HTML 4 (Hypertext Markup Language), both protocols for creating Web documents

.XI
Instrument sample file found in Scream Tracker applications for composing digital music

.XI
Instrument file used in FastTracker II, a digital music editor and player from Starbreeze Studios AB

.XIF
Image file created in Pagis, a family of scanning applications from ScanSoft

.XLA
Add-in file found in Microsoft Excel spreadsheet applications

.XLA
Archive file created in Xlib, a library that enables programs to access the X server in the X window environment

.XLA
Add-in file found in Microsoft Excel (Office) 2002

.XLB
Data file found in Microsoft Excel spreadsheet applications

.XLC
Chart file found in Microsoft Excel spreadsheet applications

.XLK
Backup file found in Microsoft Excel spreadsheet applications

.XLL
Add-in file found in the Microsoft Excel spreadsheet application

.XLL
Dynamic link library file used in the Microsoft Excel spreadsheet application

.XLM
Macro file found in Microsoft Excel spreadsheet applications

.XLR
Spreadsheet file found in Microsoft Works Suite 2002

.XLS
Worksheet file found in Microsoft Excel spreadsheet applications

.XLT
Template file used in Microsoft Excel spreadsheet applications

.XLT
Translation table used in ProComm Plus, a security application from Symantec

.XLW
Workbook file created in Excel (Microsoft Office 2002)

.XM
Music module file found in FastTracker II, a digital music editor and player from Starbreeze Studios AB

.XML
XML spreadsheet file found in Microsoft Excel 2002

.XML
A file created in the Extensible Markup Language, a protocol for designing Web documents

.XNK
Shortcut file used in the Microsoft Exchange, a line of messaging and collaborating program

.XOF
Three-dimensional object file found in the RealityLab 3D rendering program, from RenderMorphics / Microsoft

.XOR
Three-dimensional object file (External Object Representation format), created by the Royal Institute of Technology

.XQT
Macro file used in SuperCalc, a scientific calculator program written in Java

.XQT
Executable file associated with Waffle, a USENET-compatible bulletin board system

.XTP
Data file used in XTree and XTree Gold, disk management software from Central Point Software

.XWK
Keyboard mapping file used with Crosstalk Communicator, fax/modem software from Intel

.XWP
Session file found in Crosstalk Communicator, fax/modem software from Intel

.XWP
Text file created in Xerox Writer, a word-processing application

.XY
Text file created in XyWrite, a word-processing program from The Technology Group

.XYP
Document file created in XyWrite Plus, a word-processing program from The Technology Group

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Y

.Y
Grammar file used in YaaC (Yet another advanced CATI system), a program to manage computer-assisted telephone interviewing (CATI) and telemarketing

.Y
Compressed archive file made with the Yabba compression utility for the Unix operating system

.YAL
Library file found in the Arts & Letters Express family of clip-art applications, from Arts & Letters

.YAODL
Three-dimensional object file (Yet Another Object Description Language format) found in the Powerflip program, from Silicon Graphics

.YBK
Yearbook file used in Microsoft Encarta, a reference application

.YDL
Three-dimensional object file (Yet Another Object Description Language format) found in the Powerflip program, from Silicon Graphics

.YUV
Graphics file found in the YUV color-encoding scheme

.YZ
Compressed file made with the YAC (Yet Another Compressor) utility

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Z

.Z
Compressed ASCII archive file; also, a compressed file used in the Unix operating system

.ZAP
Compressed file created by FileWrangler, a file management application from CursorArts

.ZGM
Graphics file found in applications from Zenographics, makers of imaging and printing applications

.ZIP
Compressed archive file created by PKZIP, from PKWare

.ZVD
Voice file used with the Z-Fax fax/modem, from ZyXEL Communications Co.

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