MicrosoftВ® Computer Dictionary, Fifth Edition

Appendix B

Common File Extensions
File Extension Type of File
.0 File containing information on hard disk compressed with DoubleSpace.
.123 Spreadsheet file in Lotus 123.
.4th Source file in Forth.
.a Source file in Macintosh Assembly.
.ad Screensaver file in After Dark.
.ada Source file in Ada.
.ai Vector graphic file in Adobe Illustrator.
.aif See .aiff.
.aifc See .aiff.
.aiff Audio file in the Apple Audio Interchange Format originally used on Apple and Silicon Graphics (SGI) computers.
.ani
  1. Animated cursor file in Microsoft Windows 9x and Windows NT.

  2. Animation file.
.aol File related to America Online.
.aps Source file in Microsoft Visual C++.
.arc Archive file compressed with ARC.
.arj Archive file compressed with ARJ.
.asc
  1. ASCII text file.

  2. File encrypted with PGP (Pretty Good Privacy).
.asf File in Microsoft Advanced Streaming Format.
.asm Source file in Assembler.
.asp File in Active Server Page format, generally found on the World Wide Web.
.atm File in Adobe Type Manager.
.au Sound file, generally on UNIX systems or the World Wide Web.
.avi Audio visual interleaved data file in the Microsoft RIFF format.
.bac See .bak.
.bak Backup file.
.bas Source file in Basic.
.bat Batch program file.
.bfc Briefcase file in Microsoft Windows 9x.
.bin
  1. Archive file compressed with MacBinary.

  2. Binary file.
.bk See .bak.
.bmk Bookmarked file.
.bmp Raster graphics file stored in bitmap format.
.box Mailbox file in Lotus Notes.
.c Source file in C.
.c++ Source file in C++.
.cab Microsoft cabinet file multiple files compressed into one and extractable with the extract.exe utility.
.cas Comma-delimited ASCII text file.
.cb Clean boot file in Microsoft Windows.
.cbl Source file in Cobol.
.cca E-mail message in Lotus cc:mail.
.cda CD audio track.
.cdf
  1. File in Microsoft Channel Definition Format.

  2. File in Common Data Format.
.cdi File in Phillips Compact Disk Interactive format.
.cdr Vector graphics file in CorelDraw.
.cgi File containing Common Gateway Interface scripts, generally for use on the World Wide Web.
.cgm Vector graphics file in Computer Graphics Metafile format.
.chk Portions of unidentifiable files saved in Windows by the Disk Defragmentor or ScanDisk utilities.
.chm File containing compiled HTML.
.cil Microsoft Clip Gallery download package.
.class Class file in Java.
.clp Temporary file created by Microsoft Windows Clipboard utility.
.cmd Command file in Windows NT, OS/2, MS-DOS, and CP/M.
.cmf File in Corel Metafile.
.cob Source file in Cobol.
.com Command file or program.
.cpl Control Panel file in Microsoft Windows 9x.
.cpp Source file in C++.
.crt Certificate file.
.css Cascading Style Sheet file, generally used in conjunction with Web sites.
.csv Comma-delimited text file.
.ct Graphics file in Paint Shop Pro.
.cur Cursor file in Windows.
.cxx Source file in C++.
.dat Data file.
.dbf Database in dBASE and FoxPro.
.dcr Multimedia file in Macromedia Shockwave.
.dib Graphics file in Device Independent Bitmap format.
.dif File in Data Interchange Format.
.dll Dynamic-link library file.
.doc
  1. Document file in Microsoft Word.

  2. In the past, document file in Adobe FrameMaker or WordStar.

  3. Document file formatted for a word processor.
.dos MS-DOS related files in Microsoft Windows 9x.
.dot Document template in Microsoft Word.
.drv Device driver.
.dtd Document Type Definition file in SGML or XML.
.dtp Document file in Microsoft Publisher or PublishIt!
.dv Video file.
.dvi Document file in TEX Device Independent File format.
.emf File in Enhanced Windows Metafile format.
.eml Mail message in Microsoft Outlook Express.
.eps Encapsulated PostScript file.
.exe Executable program or file.
.F Source file in Fortran.
.F77 Source file in Fortran 77.
.F90 Source file in Fortran 90.
.fax Fax file in many Fax programs.
.fdf File in Adobe Acrobat Forms.
.fla Movie file in Macromedia Flash.
.fli Animation file in AutoDesk FLIC file.
.flf Device driver in OS/2.
.fm Document file in Adobe FrameMaker.
.fon System font file in Windows.
.for Source file in Fortran.
.fp File in FileMaker Pro.
.fpt See .fp.
.frm Document file in Adobe FrameMaker.
.gid Index file in Windows 9x.
.gif Raster image file in GIF format.
.giff See .gif.
.gtar UNIX archive file compressed in GNU tar utility.
.gz UNIX archive file compressed by gzip.
.gzip See .gz.
.h Header file.
.hdf File in Hierarchical Data Format.
.hex File encoded with Macintosh BinHex utility.
.hlp Help file in Microsoft Windows.
.hqx File encoded with BinHex utility.
.htm See .html.
.html HTML file, most commonly used as a Web page.
.ico Icon file in Microsoft Windows 9x.
.iff
  1. Image or sound file in IFF format.

  2. Data file on Amiga systems.
.image Image file in Macintosh Disk Image format.
.inf Device information file, which contains scripts used to control hardware operations.
.ini In MS-DOS and Windows 3.x, an initialization file, which contains user preferences and startup information about an application program.
.ins File containing InstallShield install script.
.isu File containing InstallShield uninstall script.
.jas Image file in JAS format.
.jav See .java.
.java Source file in Java.
.jff See .jpg.
.jfif See .jpg.
.jpe See .jpg.
.jpeg See .jpg.
.jpg Graphic image file encoded in the JPEG File Interchange Format.
.js Source file in JavaScript.
.l Source file in LISP.
.latex Text file in LaTeX.
.lha Archive file compressed with LZH.
.lib Library file in many programming languages.
.lnk Shortcut file in Windows 9x and Windows NT 4.
.log Log file.
.lsp Source file in LISP.
.lzh See .lha.
.mac Image file in MacPaint.
.mak Project file in Microsoft Visual Basic or Microsoft Visual C++.
.man Manual page in UNIX.
.mbox Mailbox file in BSD UNIX.
.mbx
  1. Address file in Microsoft Outlook.

  2. Mailbox file in Eudora.
.mcw Document file in Microsoft Word for the Macintosh.
.mdb Database in Microsoft Access.
.mic Image file in Microsoft Image Composer.
.mid Music file in MIDI format.
.midi See .mid.
.mime File encoded in MIME format.
.moov Video file in Apple QuickTime.
.mov See .moov.
.movie See .moov.
.mp2 Audio file compressed and encoded according to the MPEG Audio Layer-2 standard.
.mp3 Audio file compressed and encoded according to the MPEG Audio Layer-3 standard.
.mpe See .mpg.
.mpeg See .mpg.
.mpg Compressed video and audio file in MPEG format.
.mpp
  1. Graphics file in CAD format.

  2. File in Microsoft Project.
.msg E-mail message in Microsoft Outlook.
.ncb File in Microsoft Developer Studio.
.ncf Command file in Novell NetWare.
.ncf Temporary file created by Microsoft Windows Clipboard utility.
.net Network configuration file.
.newsrc Setup file for UNIX-based newsreaders.
.nlb Data file in Oracle 7.
.nlm Module file in Novell NetWare.
.nsf Database in Lotus Notes.
.nws News message file in Microsoft Outlook Express.
.obd File in Microsoft Office Binder.
.ocx Microsoft OLE control.
.ole Microsoft OLE object.
.opt See .ncb.
.p Source file in Pascal.
.p65 Document file in PageMaker 6.5.
.pab Address book file in Microsoft Outlook.
.pcd Image file in Kodak Photo-CD.
.pcl File in Hewlett-Packard Printer Control Language.
.pcx Bitmapped image file in PC Paintbrush.
.pdf Document file encoded in Adobe Portable Document Format.
.pgp File encrypted in PGP (Pretty Good Privacy).
.pic
  1. Image file in PC Paint format.

  2. See .pict.
.pict Image file in the Macintosh PICT.
.pl
  1. Source file in Perl.

  2. Source file in Prolog.
.png Bitmap image file in PNG format.
.pps
  1. Image file in Paint Shop Pro.

  2. Slide show file in Microsoft PowerPoint.
.ppt Presentation file in Microsoft PowerPoint.
.prc Text or program file for 3Com PalmPilot.
.prg File in Microsoft FoxPro, Ashton-Tate dBase, or CA Clipper.
.ps PostScript printer file.
.psd Image file in Adobe PhotoShop.
.pst Personal File Folder file in Microsoft Outlook.
.pub Document file in Ventura Publisher, Adobe PageMaker, or Microsoft Publisher.
.pwd Document file in Microsoft Pocket Word for handheld and palm-size computers.
.pwl Password file in Microsoft Windows 9x.
.pxl Spreadsheet file in Microsoft Pocket Excel for handheld and palm-size computers.
.qic Backup file in Microsoft Backup.
.qif See .qti.
.qt See .qtm.
.qti Image file in Apple QuickTime.
.qtif See .qti.
.qtm Movie file in Apple QuickTime.
.qts See .qti.
.qtx See .qti.
.qxd Document file in QuarkXPress.
.ra Sound file in RealAudio.
.ram Metafile in RealAudio.
.ras Raster image bitmap on Sun systems.
.rast See .ras.
.raw Bitmap file in RAW format.
.rdf Resource Description Framework file in XML.
.rgb See .raw.
.rif Bitmap file in RIFF format.
.riff See .rif.
.rle Bitmap file in RLE compression scheme.
.rm Video file in RealAudio.
.rtf Document file in Rich Text Format.
.s
  1. Source file in Assembler.

  2. Source file in Scheme.
.sam Document file in Lotus Ami Professional.
.sav
  1. Saved file in many games.

  2. Saved backup file.
.scc File in Microsoft SourceSafe.
.scd File in Microsoft Schedule+.
.scr Screensaver file in Microsoft Windows.
.sea Self-extracting Macintosh archive file compressed with StuffIt.
.set File set in Microsoft Backup.
.sgm File in SGML.
.sgml See .sgm.
.shtml
  1. File in HTML format that has SSI (server side includes).

  2. Secure file in HTML.
.sig Signature file for e-mail or Internet newsgroup use.
.sit Macintosh archive file compressed with StuffIt.
.sm Source file in Smalltalk.
.snd
  1. Interchangeable sound file format used on Sun, NeXT, and Silicon Graphics computers, consisting of raw audio data preceded by a text identifier.

  2. Sound resource file on the Macintosh.
.spl File in Macromedia Shockwave Flash.
.sql Query or report file in SQL.
.stm See .shtml.
.sun Raster graphics file in Sun systems.
.swa Audio file in Macromedia Shockwave.
.swf File in Macromedia Shockwave Flash.
.swp Swap file in Microsoft Windows.
.sys System configuration file.
.tar Uncompressed UNIX archive in tar format.
.taz UNIX archive file in Gzip or tar format.
.tcl Source file in TCL.
.tga Bitmap file in Targa format.
.tif Bitmap images in TIFF format.
.tiff See .tif.
.tmp Temporary file in Windows.
.tsv Tab separated values file.
.ttf TrueType font file.
.txt ASCII text file.
.udf Database file in Microsoft Windows NT.
.uri File containing list of URIs.
.url Shortcut file on the Internet for a URL.
.uu See .uud.
.uud Binary file that has been translated into ASCII format using uuencode.
.uue File that has been decoded from ASCII format back into binary format using uudecode.
.vbx Custom control in Microsoft Visual Basic.
.vda See .tga.
.vp Document file in Ventura Publisher.
.vrm
  1. See .vrml.

  2. Source file in Visual ReXX.
.vrml A 3-D graphics file in VRML.
.vst Bitmap image file in Targa.
.vxd Virtual device driver in Microsoft Windows.
.wab E-mail file in Microsoft Outlook Express.
.wav Sound file stored in waveform (WAV) audio format.
.wmf Vector image file encoded as a Microsoft Windows Metafile.
.wp Document file in Corel WordPerfect.
.wp6 Document file in Corel WordPerfect 6.x.
.wpd See .wp.
.wpg Graphic file in Corel WordPerfect.
.wps Document file in Microsoft Works.
.wri Document file in Microsoft Write.
.xls Spreadsheet file in Microsoft Excel.
.z UNIX file archive compressed with gzip.
.Z UNIX file archive compressed with compress utility.
.zip Archive file compressed in ZIP format with PKZIP or WinZip.
.zoo Archive file compressed with zoo.

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