A Guide to File Extensions You will find attached a list of the extensions you might find on your pc, floppy or the internet. The list includes the extension, description, whether it's text, and the likely programs to use to view the contents. Because I included the internet there are unix, mac, … files included - where possible I've include PC programs which will read them. Some of the programs will only read or write or only accept certain variants of the file so even though a program is listed it doesn't mean it will read your particular version of the file. I have done my best to keep this accurate but this is supplied on a all care but no responsibility basis. Extension Description Ascii/Bin Viewer $$$ Used by OS/2 to keep track of Archived files ? *KW Contains all keywords for a specific letter in the ? RoboHELP Help project Index Designer. Where * is a letter eg AKW will contain the index for works starting with the letter A. @@@ Screen files used in the installation and instruction on ? use of such applications as Microsoft Codeview for C \ FoxPro Memo File for a Label (See LBL Extension) FoxBase, Foxpro ~DF A backup of a DFM file. (See the DFM File Extension) ? ~DP A backup of a DPR file. (See the DPR File Extension) ? ~PA A backup of a PAS file. (See the PAS File Extension) ? ~xx usually a backup file ? 001 Hayes JT Fax format Bin PhotoImpact 00n Used to signify a backup version of a file. It should be Either ? fine to remove them. 01 Mime Compressed Archive Bin ? 10X Gemini 10x printer graphics file format Bin pbmplus, pbmto10x 123 Lotus 123 97 file (See file 123 file extension) Bin ? 12M Lotus 123 97 Smartmaster file (See file 123 file Bin ? extension) 2GR VGA Graphics driver/configuration files under Bin ? Windows (See 3GR file extension) 301 Brooktrout Fax Mail file format Bin ? 386 Windows 386 Enhanced Mode Driver file Bin ? 3DM Apple 3d Metafile (See extension 3DMF) Bin ? 3D NURBS modeller from Rhino ? 3DMF The Apple 3d Metafile format used by Quickdraw 3D Bin ? (See extension 3DM) 3Dn (3D, 3D2, 3D4) Used by Sterio Cad 3D package for the Bin ? Atari ST. The File Format can store up to 40 Objects containing Liting and Colour palettes. 3DS Autodesk 3D Studio Animation file for the PC. Bin 3D Studio Saturday, 15 June 2002 Copyright Wayne Corbin (1997 - 2002) Page 1 of 77 Any additional information or Corrections happily received := [email protected] Extension Description Ascii/Bin Viewer 3DX Designed to give optimised display modes for clips and Bin ? animation. 3GR VGA Graphics driver/configuration files under Bin ? Windows (See 3GR file extension) 4GE Informix 4GL compiled code (See 4GL file extension) Bin ? 4GL Informix 4GL source code (See 4GE file extension) ? 669 Unis composer music mod file Bin ? A Object code Library Bin ? IMG Software Set Image ? A4P Authorware file packaged without runtime (See AnM Bin ? and AnW file extensions) A8 Cubicomp PictureMaker files are used in broadcast- Bin Alchemy quality three dimensional modeling and animation. PictureMaker images have either three or four separate files per image: a red file, a green file, a blue file, and an optional alpha channel file. This File format is the optional Alpha channel image data. (See R8, G8, B8 File Extensions) AAM Mediashockwave Image (See AAS file Extension) Bin ? AAS Autodesk Animator video Ascii ? Authorware shocked Packet (See AAM file extension) Bin ? ABC Abc flowcharter Chart File Bin AbcFlowcharter ABEKAS Digital Video file Bin DeBabelizer ABF Adobe Systems binary screen font format. Binary Bin ? version of BDF file extension. One font information stored in 8, 16, or 32 bit words of big or little indian format. (see also BDF file extensions) ABK CorelDraw Autobackup Bin Corel Draw ABR Photoshop Brushed file format. (See also AMP, ACT, PhotoShop ACO, ACM, ACV, ADO, AHS, HSS, API, ACF, ALV, AMS, AXT, ASR, ASV, ASP, AST, ATF file extensions) ACAD AutoCAD database file Bin pbmplus, ppmtoacad ACC Altamira Image Composer Bin ? ACCOM Graphics Image Format Bin DeBabelizer ACE Compression file format - Ace Archiver Bin ? ACF Photoshop Custom Kernel. (See also AMP, ABR, PhotoShop ACT, ACO, ACM, ACV, ADO, AHS, HSS, API, ALV, AMS, AXT, ASR, ASV, ASP, AST, ATF file extensions) Saturday, 15 June 2002 Copyright Wayne Corbin (1997 - 2002) Page 2 of 77 Any additional information or Corrections happily received := [email protected] Extension Description Ascii/Bin Viewer ACFM Adobe font metrics file format file. AFM is adobes file Ascii ? format for storing font metric data. This format is also known as Adobe multiple font metrics (AMFM) and Adobe Composite font Metrics (ACFM). One AFM file is used per master design of a font containing base or composite font information. AMFM files contain control and global font information for a group of AFM files. ACFM contain global metrics of the composite font program. (See AFM, and AMFM Extensions) Specs can be got from ADOBE. ACL Lotus Notes Access Control List Bin ? Corel Draw 6 Keyboard accelerator ? ACM Used by windows in the system Directory ? Photoshop command buttons file. (See also AMP, PhotoShop ABR, ACT, ACO, ACV, ADO, AHS, HSS, API, ACF, ALV, AMS, AXT, ASR, ASV, ASP, AST, ATF file extensions) ACO Photoshop colours file format. (See also AMP, ABR, PhotoShop ACT, ACM, ACV, ADO, AHS, HSS, API, ACF, ALV, AMS, AXT, ASR, ASV, ASP, AST, ATF file extensions) ACP MS Office Actor Preview file Bin ? ACR American College of Radiology file format. This file Bin ? format is a standard for ACR-NEMA (National Electrical Manufacturers Association) medical image files. ACT FoxPro Documenting Wizard Action Diagrams ? Ms Office Assistants Actor file Bin Excel, MS Access, MS Office, MS Word Photoshop Colour Table (See also AMP, ABR, ACO, PhotoShop ACM, ACV, ADO, AHS, HSS, API, ACF, ALV, AMS, AXT, ASR, ASV, ASP, AST, ATF file extensions) ACV OS/2 driver that compress and decompress audio data ? Photoshop Curves file. (See also AMP, ABR, ACT, PhotoShop ACO, ACM, ADO, AHS, HSS, API, ACF, ALV, AMS, AXT, ASR, ASV, ASP, AST, ATF file extensions) AD After Dark screen saver Module. (See ADR ADM file Bin AfterDark extensions) ADA ADA source text (Non GNAT) (See ADB, ADS file ? extension) ADB ADA source text (GNAT) (See ADB, ADS file ? extension) Appointment database used by HP 1100LX organiser Bin ? ADD OS/2 adapter drivers used in the boot process Bin ? ADE Microsoft Access Project Extension Bin MS Access Saturday, 15 June 2002 Copyright Wayne Corbin (1997 - 2002) Page 3 of 77 Any additional information or Corrections happily received := [email protected] Extension Description Ascii/Bin Viewer ADEX ADEX files are used by the ADEX Corporation Bin ? ChromaGraph series of graphics cards. Some ADEX files don't contain a palette; in those cases there's usually a second ADEX file which contains the palette to be used. (4,8 bit) (See IMG RLE file Extensions) ADF Amiga Disk File ? ADI AutoCAD Device-Independent Binary Plotter format. Bin MS Word Generated by AutoCAD as monochrome bitmaps. ADM After Dark MultiModule screensaver (See AD ADR ? file extensions) Windows 95 or NT system policy Templates. In Ms System Policy Editor Windows 95 and Windows NT 4.0, you can use the System Policy Editor to configure client computers from a central location by creating a single system policy file that resides on a server. When users log on to the network, client computers use the system policy file to modify local copies of the Windows registry. ADO Photoshop Duotone file format. (See also AMP, ABR, PhotoShop ACT, ACO, ACM, ACV, AHS, HSS, API, ACF, ALV, AMS, AXT, ASR, ASV, ASP, AST, ATF file extensions) ADP Used by Faxworks to do modem interaction ? Astound Dynamite file ? Microsoft Access Project Bin MS Access ADR AfterDark Randomiser screensaver (See AD ADM file ? extensions) ADS Ada source text (GNAT) (See ADA, ADB file Ascii Notepad extension) ADX Approach Database index. Bin Approach AF2 Abc flowcharter Chart File Bin AbcFlowcharter AF3 Abc flowcharter Chart File Bin AbcFlowcharter AFM Adobe font metrics file format file. AFM is adobes file Ascii ? format for storing font metric data. This format is also known as Adobe multiple font metrics (AMFM) and Adobe Composite font Metrics (ACFM). One AFM file is used per master design of a font containing base or composite font information. AMFM files contain control and global font information for a group of AFM files. ACFM contain global metrics of the composite font program. (See AMFM, and ACFM Extensions) Specs can be got from ADOBE. Adobe Font Map - Bitstream Fontware 3.x Postscript Bin ? Font. (See PSB, PSO) AFT Abc flowcharter Template File Bin AbcFlowcharter AFW Abc flowcharter workspace File Bin ? Saturday, 15 June 2002 Copyright Wayne Corbin (1997 - 2002) Page 4 of 77 Any additional information or Corrections happily received := [email protected] Extension Description Ascii/Bin Viewer AHS Photoshop Halftone screens. (See also AMP, ABR, PhotoShop ACT, ACO, ACM, ACV, ADO, HSS, API, ACF, ALV, AMS, AXT, ASR, ASV, ASP, AST, ATF file extensions) AI Native format of the Adobe Illustrator program. A Bin Illustrator, Picture Publisher variation of the .eps format. (Vector/Metafile) AID Apple AIFF format (equivalent to Windows WAVs). Bin Naplayer, SoundPlayer AIF Audio Interchange File Format. This sound format is Bin Naplayer, SoundPlayer, Wham predominantly used by Silicon Graphics and Macintosh applications. (equivalent to Windows WAVs). (See AIFF and AIFC Extensions) AIFC Audio Interchange File Format. This sound format is Bin Naplayer, SoundPlayer predominantly used by Silicon Graphics and Macintosh applications. (equivalent to Windows WAVs). (See AIFF and AIF Extensions) AIFF Audio Interchange File Format.