Una extensión de archivo es el grupo de letras después de un "punto" en un nombre de archivo. La extensión indica el formato o el tipo de archivo. Por ejemplo, en el nombre del archivo "readme.txt," la extensión "txt" denota un archivo de texto que se puede ver usando un editor de texto como Notepad o Word.
Los sistemas operativos, como Mac OS o Windows, utilizan la extensión de archivo para elegir que programa abrir cuando un usuario hace doble click sobre un archivo.
| .3DS | 3D Studio |
| .906 | Calcomp plotter |
| . ABC | A Program's Master Index |
| . ABK | CorelDRAW auto backup |
| . ACL | CorelDRAW keyboard accelerator |
| . AD | After Dark image |
| . ADM | After Dark MultiModule |
| . ADR | After Dark Randomizer |
| . AFM | Adobe font metrics (Type 1) |
| . AG4 | Access G4 document imaging |
| . AI | Adobe Illustrator graphics |
| . AI | Encapsulated PostScript header |
| . AIF | Digital audio (Mac) |
| . AIFC | Digital audio (Mac) |
| . ALB | JASC Image Commander |
| . ANI | Animated cursor |
| . ANN | Windows help annotations |
| . ANS | ANSI text |
| . ARC | ARC, ARC+ compressed archive |
| . ARJ | Compressed archive (Jung) |
| . ART | Xara Studio drawing |
| . ASA | ASP info |
| . ASAX | ASP.NET file |
| . ASC | ASCII file |
| . ASCX | ASP.NET file |
| . ASD | Word temporary document |
| . ASF | NetShow file |
| . ASM | Assembly source code |
| . ASMX | ASP.NET file |
| . ASP | Active Server Page |
| . ASPX | ASP.NET file |
| . ASX | NetShow file |
| . ATT | AT&T Group IV fax |
| . AU | Digital audio (Sun) |
| . AVI | Microsoft movie format |
| . AXD | Actrix drawing |
| . BAK | Backup |
| . BAS | BASIC source code |
| . BAT | DOS, OS/2 batch file |
| . BFC | Windows briefcase document |
| . BIN | Driver, overlay |
| . BM1 | Apogee BioMenace file |
| . BML | Bookmark library (SyncURL) |
| . BMP | Windows & OS/2 bitmap |
| . BMK | Windows help bookmarks |
| . BMS | BlackMagic script |
| . BRK | Brooktrout fax |
| . BS1 | Apogee Blake Stone file |
| . C | C source code |
| . CAB | Microsoft compressed format for distribution |
| . CAL | Windows calendar, |
| . CAL | SuperCalc spreadsheet, |
| . CAL | CALS raster and vector formats |
| . CAP | Ventura Pub. captions |
| . CAL | CALS raster and vector formats |
| . CCB | Visual Basic animated button |
| . CCH | Corel Chart |
| . CDA | CD audio track |
| . CDR | CorelDRAW vector graphics |
| . CDT | CorelDRAW template |
| . CDX | CorelDRAW compressed drawing |
| . CDX | FoxPro and Clipper index |
| . CFG | Configuration |
| . CGM | CGM vector graphics |
| . CH3 | Harvard Graphics chart |
| . CHP | Ventura Pub. chapter |
| . CHK | DOS/Windows corrupted file (Chkdsk) |
| . CIF | Ventura Pub. chapter info. |
| . CIT | Intergraph scanned image |
| . CK? | iD/Apogee Commander Keen ? |
| . COB | COBOL source code, |
| . COB | Truespace 3-D file |
| . CLP | Windows clipboard |
| . CLS | Visual Basic class module |
| . CMF | Corel metafile |
| . CMP | JPEG bitmap, LEAD bitmap |
| . CMP | RichLink composed format |
| . CMX | Corel clip art |
| . CMV | Corel Presentation Exchange |
| . CNT | Windows help contents |
| . COM | Executable program |
| . CPD | Fax cover document |
| . CPE | Fax cover document |
| . CPI | DOS code page |
| . CPL | Windows control panel applets |
| . CPL | Corel color palette |
| . CPP | C++ source code |
| . CPR | Knowledge Access bitmap |
| . CPR | Corel Presents presentation |
| . CPT | Corel Photopaint image |
| . CPX | Corel Presentation Exchange |
| . CRD | Cardfile file |
| . CRP | Corel Presents runtime presentation |
| . CSC | Corel script |
| . CSV | Comma delimited |
| . CT | Scitex CT bitmap |
| . CUR | Cursor |
| . CUT | Dr. Halo bitmap |
| . CV5 | Canvas 5 vector/bitmap |
| . DAT | Data |
| . DAT | WordPerfect merge data |
| . DB | Paradox table |
| . DBF | dBASE database |
| . DBT | dBASE text |
| . DBX | DATABEAM bitmap |
| . DCA | IBM text |
| . DCM | DICOM medical image |
| . DCS | Color separated EPS format |
| . DCX | Intel fax image |
| . DCT | Dictionary |
| . DEF | Definition |
| . DG | Autotrol vector graphics |
| . DGN | Intergraph vector graphics |
| . DIB | Windows DIB bitmap |
| . DIC | Dictionary |
| . DIF | Spreadsheet |
| . DISCO | Publishing and Discovering Web Services |
| . DLG | Dialogue script |
| . DLL | Dynamic link library |
| . DOC | Document (Word and others) |
| . DOT | Word template |
| . DOX | MultiMate V4.0 document |
| . DPI | Pointline bitmap |
| . DRV | Driver |
| . DRW | Designer vector graphics (Version 2.x, 3.x) |
| . DS4 | Designer vector graphics (Version 4.x) |
| . DSF | Designer vector graphics (Version 6.x) |
| . DWG | AutoCAD vector format |
| . DX | Autotrol document imaging |
| . DXF | AutoCAD vector format |
| . ED5 | EDMICS bitmap (DOD) |
| . EMF | Enhanced Windows metafile |
| . EPS | Encapsulated PostScript |
| . ESI | Esri plot file (vector) |
| . EVY | Envoy document |
| . EXE | Executable program |
| . FAX | Various fax formats |
| . FDX | Force index |
| . FH3 | Freehand 3 |
| . FLC | Autodesk animation |
| . FLD | Hijaak thumbnail folder |
| . FLI | Autodesk animation |
| . FLT | Graphics conversion filter |
| . FMT | dBASE Screen format |
| . FMV | FrameMaker raster & vector graphics |
| . FNT | Windows font |
| . FOG | Fontographer font |
| . FON | Windows bitmapped font, |
| . FON | Telephone file |
| . FOR | FORTRAN source code |
| . FOT | Windows TrueType font info. |
| . FOX | FoxBase compiled program |
| . FM3 | Format info for 1-2-3 Version 3 |
| . FP1 | Flying Pigs for Windows data |
| . FPX | FlashPix bitmap |
| . FRM | dBASE report layout |
| . FTG | Windows help file links |
| . FTS | Windows help text search index |
| . G4 | GTX RasterCAD (raster into vector) |
| . GAL | Corel Multimedia Manager album |
| . GCA | IBM MO:DCA - GOCA vector graphics |
| . GDF | GDDM format |
| . GED | Arts & Letters graphics |
| . GEM | GEM vector graphics |
| . GFI | Genigraphics presentation link |
| . GFX | Genigraphics presentation link |
| . GID | Windows help global index |
| . GIF | CompuServe bitmap |
| . GIM | Genigraphics presentation link |
| . GIX | Genigraphics presentation link |
| . GNA | Genigraphics presentation link |
| . GNX | Genigraphics presentation link |
| . GP4 | CALS Group IV - ITU Group IV |
| . GRA | Microsoft graph |
| . GRF | Micrografx Charisma vector graphics |
| . GRP | Windows ProgMan Group |
| . GWX | Genigraphics presentation link |
| . GWZ | Genigraphics presentation link |
| . GX1 | Show Partner bitmap |
| . GX2 | Show Partner bitmap |
| . GZ | UNIX Gzip |
| . H | C header |
| . HED | HighEdit document |
| . HGL | HP Graphics language |
| . HLP | Help text |
| . HPJ | Visual Basic help project |
| . HPP | C++ program header |
| . HPL | HP Graphics language |
| . HQX | BinHex format |
| . HT | HyperTerminal |
| . HTM | HTML document (Web page) |
| . HTML | HTML document (Web page) |
| . HTX | HTML extension file |
| . HYC | WordPerfect hypen list |
| . ICA | IBM MO:DCA - IOCA bitmap |
| . ICB | Targa bitmap |
| . ICO | Windows icon |
| . IDC | Internet Database Connector |
| . IDD | MIDI instrument definition |
| . IDE | Development environment configuration |
| . IDX | FoxBase index |
| . IFF | Amiga bitmap |
| . IGF | Inset Systems (Hijaak) raster & vector graphics |
| . IL | Icon library (hDC Computer) |
| . IMG | ISO 9660 CD-ROM image |
| . IMG | Macintosh image file |
| . IMG | GEM Paint bitmap |
| . INF | Setup information |
| . INI | Initialization |
| . JFF | JPEG bitmap |
| . JIF | JPEG bitmap |
| . JPG | JPEG bitmap |
| . JS | JavaScript file |
| . JT | JT Fax |
| . JTF | JPEG bitmap |
| . KDC | Kodak Photo bitmap |
| . KFX | Kofax Group IV fax |
| . KYE | Kye game program data |
| . LBL | dBASE label |
| . LBM | Deluxe Paint graphics |
| . LEG | Legacy text |
| . LIB | Function library |
| . LIT | Microsoft Reader file |
| . LOG | Log file |
| . LNK | Windows 9x/NT shortcut |
| . LQT | Liquid Audio |
| . LSN | Topic list (CDE) |
| . LST | List |
| . LV | LaserView Group IV |
| . LZH | LHARC compressed |
| . LZS | Skyroads program data |
| . M1V | MPEG file |
| . M3U | MPEG file |
| . MAC | MacPaint bitmap |
| . MAK | Visual Basic/MS C++ project |
| . MAP | Link editor map |
| . MB1 | Apogee Moster Bash file |
| . MBX | Mailbox (e-mail) |
| . MCS | MathCAD format |
| . MCW | Word for Macintosh document |
| . MDB | Access database |
| . MEL | Maya script |
| . MET | OS/2 Metafile |
| . MEU | Menu items |
| . MDX | dBASE IV multi-index |
| . MID | MIDI sound file |
| . MID | Eudora script file |
| . MIL | Same as GP4 |
| . MIX | PhotoDraw file |
| . MME | MIME-encoded file |
| . MMF | Microsoft mail file |
| . MMM | Macromind animation format |
| . MOD | Eudora script file |
| . MOV | QuickTime movie |
| . MPA | MPEG file |
| . MP2 | MPEG file |
| . MP2V | MPEG file |
| . MP3 | MPEG-1 Layer 3 audio |
| . MPE | MPEG file |
| . MPEG | MPEG file |
| . MPG | MPEG file |
| . MPP | Microsoft Project |
| . MRK | Informative Graphics markup file |
| . MSG | Message file |
| . MSP | Microsoft Paint bitmap |
| . MUS | Music |
| . MVB | Microsoft Multimedia Viewer |
| . M1V | MPEG file |
| . M3D | Corel Motion 3-D |
| . NAP | NAPLPS format |
| . NAV | Eudora script file |
| . NDX | dBASE index |
| . NDX | CDE index |
| . NG | Norton Guides text |
| . NLM | NetWare NLM program |
| . NTZ | InVircible antivirus blueprint |
| . O | UNIX machine language |
| . OAZ | OAZ Fax |
| . OBD | Microsoft Office binder |
| . OBJ | Machine language, |
| . OBJ | Wavefront 3-D file |
| . OBZ | Microsoft Office wizard |
| . OEB | Open eBook publication |
| . OLB | OLE object library |
| . OLE | OLE object |
| . OPF | Open package file |
| . ORG | Organizer file |
| . OTF | OpenType font |
| . OVL | Overlay module |
| . OVR | Overlay module |
| . OZM | Sharp Organizer memo bank |
| . OZP | Sharp Organizer telephone bank |
| . OUT | Encyclopedia definitions |
| . P10 | Tektronic Plot 10 |
| . PAL | Windows palette |
| . PAS | Pascal source code |
| . PAT | CorelDRAW pattern |
| . PBD | PowerBuilder dynamic library |
| . PBK | Microsoft Phonebook |
| . PBM | Portable Bitmap |
| . PCL | HP LaserJet series |
| . PCD | Photo CD bitmap |
| . PCM | LaserJet cartridge info. |
| . PCS | PICS animation |
| . PCT | PC Paint bitmap, |
| . PCT | Macintosh PICT bitmap & vector graphics |
| . PCW | PC Write document |
| . PCX | PC Paintbrush bitmap |
| Portable Document Format (Acrobat), | |
| Printer driver, | |
| Printer description (QuarkXpress) | |
| . PDV | PC Paintbrush printer driver |
| . PDW | HiJaak vector graphics |
| . PFA | Type 1 font (ASCII) |
| . PFB | Type 1 font (encrypted) |
| . PFM | Windows Type 1 font metrics |
| . PGL | HPGL 7475A plotter (vector graphics) |
| . PIC | Various vector formats: |
| . PIC | Lotus 1-2-3, |
| . PIC | Micrografx Draw, |
| . PIC | Mac PICT format, |
| . PIC | IBM Storyboard bitmap |
| . PIF | Windows info. for DOS programs, |
| . PIF | IBM Picture Interchange |
| . PIN | Epic Pinball data |
| . PIX | Inset Systems raster & vector graphics |
| . PL | Perl script |
| . PLT | AutoCAD plotter file |
| . PLT | HPGL plotter file |
| . PM | PageMaker graphics/text |
| . PMx | PageMaker document (x=ver.) |
| . PML | PageMaker library |
| . PNG | PNG bitmap |
| . POV | POV-Ray ray tracing |
| . PP4 | Picture Publisher 4 |
| . PPD | PostScript printer description |
| . PPM | Portable Pixelmap |
| . PPS | PowerPoint Slideshow |
| . PPT | PowerPoint |
| . PRC | Resource (text or program) file (3com PalmPilot) |
| . PRD | Microsoft Word printer driver |
| . PRE | Lotus Freelance |
| . PRG | dBASE source code |
| . PRN | XyWrite printer driver, |
| . PRN | Temporary print file |
| . PRS | WordPerfect printer driver, |
| . PRS | Harvard Graphics |
| . PRT | Formatted text |
| . PS | PostScript page description |
| . PSD | Photoshop native format |
| . PSR | Powersoft report |
| . PTx | PageMaker template (x=ver.) |
| . PUB | Microsoft Publisher publication, |
| . PUB | Ventura Publisher publication |
| . PUZ | Across puzzle |
| . PWL | Windows password list |
| . P10 | Tektronix Plot10 plotter (vector graphics) |
| . QBW | QuickBooks |
| . QLB | Quick programming library |
| . QLC | ATM font info. |
| . QT | QuickTime movie |
| . QTM | QuickTime movie |
| . RA | Real Audio file |
| . RAM | Real Audio file |
| . RAS | Sun bitmap |
| . RAW | 3-D file (open standard) |
| . RC | Resource script |
| . REC | Recorder file |
| . REG | Registration file |
| . RES | Programming resource |
| . RFT | DCA/RFT document |
| . RGB | SGI bitmap |
| . RIA | Alpharel Group IV bitmap |
| . RIB | Renderman graphics |
| . RIC | Roch FaxNet |
| . RIX | RIX virtual screen |
| . RLC | CAD Overlay ESP (Image Systems) |
| . RLE | Compressed (run length encoded) |
| . RLF | RichLink compiled format |
| . RM | Real Media file |
| . RMI | MIDI music |
| . RMM | Real Media file |
| . RND | AutoShade rendering format |
| . RNL | GTX Runlength bitmap |
| . RTF | Microsoft text/graphics |
| . R8P | LaserJet portrait font |
| . R8L | LaserJet landscape font |
| . RV | Real Video file |
| . SAM | Ami Pro document |
| . SAT | ACIS 3-D model |
| . SAV | Saved file |
| . SBP | IBM Storyboard graphics/Superbase text |
| . SC | Paradox source code |
| . SC? | ColoRIX raster (?=res.) |
| . SC2 | Microsoft Schedule+ 7 |
| . SCD | Microsoft Schedule+ 7 |
| . SCH | Microsoft Schedule+ 1 |
| . SCM | ScreenCam movie |
| . SCP | Dial-up Networking script |
| . SCR | Windows screen saver |
| . SCR | Generic script, |
| . SCR | Fax image |
| . SCR | dBASE screen layout, |
| . SCT | Lotus Manuscript screen capture text, |
| . SCT | Scitex bitmap |
| . SDL | SmartDraw library |
| . SDR | SmartDraw vector graphics |
| . SDT | SmartDraw template |
| . SET | Setup parameters |
| . SFP | LaserJet portrait font |
| . SFL | LaserJet landscape font |
| . SFS | PCL 5 scalable font |
| . SGI | SGI bitmap |
| . SHB | Corel Show |
| . SHG | Segmented HyperGraphic (imagemap Windows help) |
| . SHS | OLE2 package (can contain executables) |
| . SHW | Corel Show |
| . SLD | AutoCAD slide |
| . SLK | SYLK format (spreadsheets) |
| . SMI | SMIL multimedia |
| . SND | Digital audio |
| . SPD | Speedo scalable font |
| . STY | Ventura Pub. style sheet |
| . SUN | Sun bitmap |
| . SVX | Amiga sound file |
| . SWF | Shockwave file |
| . SY3 | Harvard Graphics symbol |
| . SYL | SYLK format (spreadsheets) |
| DOS, OS/2 driver | |
| . TAL | Adobe Type Align shaped text |
| . TAR | Tape archive |
| . TAZ | UNIX Gzip archive |
| . TDF | Speedo typeface definition |
| . TFM | Intellifont font metrics |
| . TGA | TARGA bitmap |
| . TGZ | UNIX Gzip archive |
| . TIF | TIFF bitmap |
| . TLB | OLE type library |
| . TMP | Temporary |
| . TOC | Table of contents |
| . TORRENT BitTorrent, P2P technology | |
| . TRM | Terminal file |
| . TTC | TrueType font compressed |
| . TTF | TrueType font |
| . TXT | ASCII text |
| . USP | LaserJet portrait font |
| . USL | LaserJet landscape font |
| . VBP | Visual Basic project |
| . VBX | Visual Basic custom control |
| . VBS | Visual Basic script |
| . VCF | vCard file |
| . VDA | Targa bitmap |
| . VGR | Ventura Pub. chapter info. |
| . VOC | Sound Blaster sound |
| . VOX | Voxware compressed audio |
| . VP | Ventural Publisher publication |
| . VSD | Visio drawing |
| . VST | Targa bitmap |
| . VUE | dBASE relational view |
| . WAV | Digital audio (Windows) |
| . WAX | WMA metafile (location of WMA file) |
| . WB? | Quattro Pro spreadsheet (?=version) |
| . WBK | Microsoft Word backup |
| . WBT | WinBatch file |
| . WCM | WordPerfect macro |
| . WDB | Microsoft works data file |
| . WGP | Wild Board games data |
| . WID | Font width table |
| . WIF | Wavelet image |
| . WIZ | Microsoft Word wizard |
| . WKQ | Quattro spreadsheet |
| . WK1 | Lotus ver. 2.x |
| . WK3 | Lotus ver. 3.x & Windows |
| . WK4 | Lotus ver. 4.x |
| . WKS | Lotus 1-2-3 ver. 1a spreadsheet |
| . WMA | Windows Media audio (ASF file) |
| . WMF | Windows Metafile |
| . WMV | Windows Media video (ASF file) |
| . WPD | Corel WordPerfect, |
| . WPD | Windows printer description |
| . WP? | WordPerfect document (?=version) |
| . WPG | WordPerfect raster & vector graphics |
| . WPM | WordPerfect macro |
| . WPT | WordPerfect template |
| . WQ? | Quattro Pro for DOS (?=version) |
| . WPS | Microsoft Works document |
| . WRI | Windows Write document |
| . WRK | Sympohony spreadsheet |
| . WRL | VRML page |
| . WS? | WordStar for Windows (?=version) |
| . WSD | WordStar 2000 document |
| . WSH | Windows Scrip Host properties |
| . WVL | Wavelet compressed file |
| . WVX | WMV metafile (location of WMV file) |
| . XAR | Corel Xara drawing |
| . XBM | X Window bitmap |
| . XFX | JetFax |
| . XLA | Excel add-in |
| . XLB | Excel toolbar |
| . XLC | Excel chart |
| . XLD | Excel dialogue |
| . XLK | Excel backup |
| . XLM | Excel macro |
| . XLS | Excel spreadsheet |
| . XLT | Excel template |
| . XLW | Excel project |
| . XML | XML file |
| . XPM | X Window pixelmap |
| . XSD | XML schema |
| . XWD | X Window dump |
| . XY? | XyWrite document (?=version) |
| . XYW | XyWrite for Windows document |
| . Z | UNIX Gzip archive |
| . ZIP | PKZIP compressed |
Más información sobre extensiones de archivo en Wikipedia
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