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Appendix B. Common File Extensions

Appendix B. Common File Extensions

File ExtensionType of File
.0File containing information on hard disk compressed with DoubleSpace.
.123Spreadsheet file in Lotus 123.
.4thSource file in Forth.
.aSource file in Macintosh Assembly.
.adScreensaver file in After Dark.
.adaSource file in Ada.
.aiVector graphic file in Adobe Illustrator.
.aifSee .aiff.
.aifcSee .aiff.
.aiffAudio 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.

.aolFile related to America Online.
.apsSource file in Microsoft Visual C++.
.arcArchive file compressed with ARC.
.arjArchive file compressed with ARJ.
.asc
  1. ASCII text file.

  2. File encrypted with PGP (Pretty Good Privacy).

.asfFile in Microsoft Advanced Streaming Format.
.asmSource file in Assembler.
.aspFile in Active Server Page format, generally found on the World Wide Web.
.atmFile in Adobe Type Manager.
.auSound file, generally on UNIX systems or the World Wide Web.
.aviAudio visual interleaved data file in the Microsoft RIFF format.
.bacSee .bak.
.bakBackup file.
.basSource file in Basic.
.batBatch program file.
.bfcBriefcase file in Microsoft Windows 9x.
.bin
  1. Archive file compressed with MacBinary.

  2. Binary file.

.bkSee .bak.
.bmkBookmarked file.
.bmpRaster graphics file stored in bitmap format.
.boxMailbox file in Lotus Notes.
.cSource file in C.
.c++Source file in C++.
.cabMicrosoft cabinet file multiple files compressed into one and extractable with the extract.exe utility.
.casComma-delimited ASCII text file.
.cbClean boot file in Microsoft Windows.
.cblSource file in Cobol.
.ccaE-mail message in Lotus cc:mail.
.cdaCD audio track.
.cdf
  1. File in Microsoft Channel Definition Format.

  2. File in Common Data Format.

.cdiFile in Phillips Compact Disk Interactive format.
.cdrVector graphics file in CorelDraw.
.cgiFile containing Common Gateway Interface scripts, generally for use on the World Wide Web.
.cgmVector graphics file in Computer Graphics Metafile format.
.chkPortions of unidentifiable files saved in Windows by the Disk Defragmentor or ScanDisk utilities.
.chmFile containing compiled HTML.
.cilMicrosoft Clip Gallery download package.
.classClass file in Java.
.clpTemporary file created by Microsoft Windows Clipboard utility.
.cmdCommand file in Windows NT, OS/2, MS-DOS, and CP/M.
.cmfFile in Corel Metafile.
.cobSource file in Cobol.
.comCommand file or program.
.cplControl Panel file in Microsoft Windows 9x.
.cppSource file in C++.
.crtCertificate file.
.cssCascading Style Sheet file, generally used in conjunction with Web sites.
.csvComma-delimited text file.
.ctGraphics file in Paint Shop Pro.
.curCursor file in Windows.
.cxxSource file in C++.
.datData file.
.dbfDatabase in dBASE and FoxPro.
.dcrMultimedia file in Macromedia Shockwave.
.dibGraphics file in Device Independent Bitmap format.
.difFile in Data Interchange Format.
.dllDynamic-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.

.dosMS-DOS– related files in Microsoft Windows 9x.
.dotDocument template in Microsoft Word.
.drvDevice driver.
.dtdDocument Type Definition file in SGML or XML.
.dtpDocument file in Microsoft Publisher or PublishIt!
.dvVideo file.
.dviDocument file in TEX Device Independent File format.
.emfFile in Enhanced Windows Metafile format.
.emlMail message in Microsoft Outlook Express.
.epsEncapsulated PostScript file.
.exeExecutable program or file.
.FSource file in Fortran.
.F77Source file in Fortran 77.
.F90Source file in Fortran 90.
.faxFax file in many Fax programs.
.fdfFile in Adobe Acrobat Forms.
.flaMovie file in Macromedia Flash.
.fliAnimation file in AutoDesk FLIC file.
.flfDevice driver in OS/2.
.fmDocument file in Adobe FrameMaker.
.fonSystem font file in Windows.
.forSource file in Fortran.
.fpFile in FileMaker Pro.
.fptSee .fp.
.frmDocument file in Adobe FrameMaker.
.gidIndex file in Windows 9x.
.gifRaster image file in GIF format.
.giffSee .gif.
.gtarUNIX archive file compressed in GNU tar utility.
.gzUNIX archive file compressed by gzip.
.gzipSee .gz.
.hHeader file.
.hdfFile in Hierarchical Data Format.
.hexFile encoded with Macintosh BinHex utility.
.hlpHelp file in Microsoft Windows.
.hqxFile encoded with BinHex utility.
.htmSee .html.
.htmlHTML file, most commonly used as a Web page.
.icoIcon file in Microsoft Windows 9x.
.iff
  1. Image or sound file in IFF format.

  2. Data file on Amiga systems.

.imageImage file in Macintosh Disk Image format.
.infDevice information file, which contains scripts used to control hardware operations.
.iniIn MS-DOS and Windows 3.x, an initialization file, which contains user preferences and startup information about an application program.
.insFile containing InstallShield install script.
.isuFile containing InstallShield uninstall script.
.jasImage file in JAS format.
.javSee .java.
.javaSource file in Java.
.jffSee .jpg.
.jfifSee .jpg.
.jpeSee .jpg.
.jpegSee .jpg.
.jpgGraphic image file encoded in the JPEG File Interchange Format.
.jsSource file in JavaScript.
.lSource file in LISP.
.latexText file in LaTeX.
.lhaArchive file compressed with LZH.
.libLibrary file in many programming languages.
.lnkShortcut file in Windows 9x and Windows NT 4.
.logLog file.
.lspSource file in LISP.
.lzhSee .lha.
.macImage file in MacPaint.
.makProject file in Microsoft Visual Basic or Microsoft Visual C++.
.manManual page in UNIX.
.mboxMailbox file in BSD UNIX.
.mbx
  1. Address file in Microsoft Outlook.

  2. Mailbox file in Eudora.

.mcwDocument file in Microsoft Word for the Macintosh.
.mdbDatabase in Microsoft Access.
.micImage file in Microsoft Image Composer.
.midMusic file in MIDI format.
.midiSee .mid.
.mimeFile encoded in MIME format.
.moovVideo file in Apple QuickTime.
.movSee .moov.
.movieSee .moov.
.mp2Audio file compressed and encoded according to the MPEG Audio Layer-2 standard.
.mp3Audio file compressed and encoded according to the MPEG Audio Layer-3 standard.
.mpeSee .mpg.
.mpegSee .mpg.
.mpgCompressed video and audio file in MPEG format.
.mpp
  1. Graphics file in CAD format.

  2. File in Microsoft Project.

.msgE-mail message in Microsoft Outlook.
.ncbFile in Microsoft Developer Studio.
.ncfCommand file in Novell NetWare.
.ncfTemporary file created by Microsoft Windows Clipboard utility.
.netNetwork configuration file.
.newsrcSetup file for UNIX-based newsreaders.
.nlbData file in Oracle 7.
.nlmModule file in Novell NetWare.
.nsfDatabase in Lotus Notes.
.nwsNews message file in Microsoft Outlook Express.
.obdFile in Microsoft Office Binder.
.ocxMicrosoft OLE control.
.oleMicrosoft OLE object
.optsee .ncb.
.pSource file in pascal.
.p65Document file in PageMaker 6.5.
.pabAddress book file in Microsoft Outlook.
.pcdImage file in Kodak Photo-CD.
.pclFile in Hewlett-Packard printer Control Language.
.pcxBitmapped image file in PC Paintbrush.
.pdfDocument file encoded in Adobe Portable Document Format.
.pgpFile encrypted in PGP (Pretty Good Privacy).
.pic
  1. Image file in PC Paint format.

  2. See .pict.

.pictImage file in the Macintosh PICT.
.pl
  1. Source file in Perl.

  2. Source file in Prolog.

.pngBitmap image file in PNG format.
.pps
  1. Image file in Paint Shop Pro.

  2. Slide show file in Microsoft PowerPoint.

.pptPresentation file in Microsoft PowerPoint.
.prcText or program file for 3Com PalmPilot.
.prgFile in Microsoft FoxPro, Ashton-Tate dBase, or CA Clipper.
.psPostScript printer file.
.psdImage file in Adobe PhotoShop.
.pstPersonal File Folder file in Microsoft Outlook.
.pubDocument file in Ventura Publisher, Adobe PageMaker, or Microsoft Publisher.
.pwdDocument file in Microsoft Pocket Word for handheld and palm-size computers.
.pwlPassword file in Microsoft Windows 9x.
.pxlSpreadsheet file in Microsoft Pocket Excel for handheld and palm-size computers.
.qicBackup file in Microsoft Backup.
.qifSee .qti.
.qtSee .qtm.
.qtiImage file in Apple QuickTime.
.qtifSee .qti.
.qtmMovie file in Apple QuickTime.
.qtsSee .qti.
.qtxSee .qti.
.qxdDocument file in QuarkXPress.
.raSound file in RealAudio.
.ramMetafile in RealAudio.
.rasRaster image bitmap on Sun systems.
.rastSee .ras.
.rawBitmap file in RAW format.
.rdfResource Description Framework file in XML.
.rgbSee .raw.
.rifBitmap file in RIFF format.
.riffSee .rif.
.rleBitmap file in RLE compression scheme.
.rmVideo file in RealAudio.
.rtfDocument file in Rich Text Format.
.s
  1. Source file in Assembler.

  2. Source file in Scheme.

.samDocument file in Lotus Ami Professional.
.sav
  1. Saved file in many games.

  2. Saved backup file.

.sccFile in Microsoft SourceSafe.
.scdFile in Microsoft Schedule+.
.scrScreensaver file in Microsoft Windows.
.seaSelf-extracting Macintosh archive file compressed with StuffIt.
.setFile set in Microsoft Backup.
.sgmFile in SGML.
.sgmlSee .sgm.
.shtml
  1. File in HTML format that has SSI (server side includes).

  2. Secure file in HTML.

.sigSignature file for e-mail or Internet newsgroup use.
.sitMacintosh archive file compressed with StuffIt.
.smSource 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.

.splFile in Macromedia Shockwave Flash.
.sqlQuery or report file in SQL.
.stmSee .shtml.
.sunRaster graphics file in Sun systems.
.swaAudio file in Macromedia Shockwave.
.swfFile in Macromedia Shockwave Flash.
.swpSwap file in Microsoft Windows.
.sysSystem configuration file.
.tarUncompressed UNIX archive in tar format.
.tazUNIX archive file in Gzip or tar format.
.tclSource file in TCL.
.tgaBitmap file in Targa format.
.tifBitmap images in TIFF format.
.tiffSee .tif.
.tmpTemporary file in Windows.
.tsvTab separated values file.
.ttfTrueType font file.
.txtASCII text file.
.udfDatabase file in Microsoft Windows NT.
.uriFile containing list of URIs.
.urlShortcut file on the Internet for a URL.
.uuSee .uud.
.uudBinary file that has been translated into ASCII format using uuencode.
.uueFile that has been decoded from ASCII format back into binary format using uudecode.
.vbxCustom control in Microsoft Visual Basic.
.vdaSee .tga.
.vpDocument file in Ventura Publisher.
.vrm
  1. See .vrml.

  2. Source file in Visual ReXX.

.vrmlA 3-D graphics file in VRML.
.vstBitmap image file in Targa.
.vxdVirtual device driver in Microsoft Windows.
.wabE-mail file in Microsoft Outlook Express.
.wavSound file stored in waveform (WAV) audio format.
.wmfVector image file encoded as a Microsoft Windows Metafile.
.wpDocument file in Corel WordPerfect.
.wp6Document file in Corel WordPerfect 6.x.
.wpdSee .wp.
.wpgGraphic file in Corel WordPerfect.
.wpsDocument file in Microsoft Works.
.wriDocument file in Microsoft Write.
.xlsSpreadsheet file in Microsoft Excel.
.zUNIX file archive compressed with gzip.
.ZUNIX file archive compressed with compress utility.
.zipArchive file compressed in ZIP format with PKZIP or WinZip.
.zooArchive file compressed with zoo.



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