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The most important file types used in Windows, Mac OS and Linux/ Unix, grouped by their extension's first letter.

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File types by extension - A

These are all file name extensions starting with letter A.


  • .a - UNIX static library file.
  • .acc - GEM desk accessories file
  • .ace - ACE Archiver compression file
  • .act - Microsoft Visual FoxPro Documenting Wizard action diagram.
  • .acv - Adobe Photoshop compensation curve file
  • .ai - PostScript viewer
  • .aid - MapXtreme generated file
  • .aif - Audio Interchange File
  • .aifc - Compressed audio file
  • .aiff - Audio Interchange File
  • .als - Part of the Delphi help file system
  • .amp - Arbitrary Map file
  • .ani - Animated cursor file
  • .app - VoxPro file / GEM file
  • .aps - Binary file
  • .arc - Compressed file
  • .arj - Compressed file
  • .asc - ASCII text file
  • .ascx - Visual Studio custom user control ource file.
  • .asf - Media player audio/visual file
  • .asm - Assembler fil
  • .asp - Active Server page
  • .aspx - ASP.NET file
  • .htm" - cs - Visual C# source file
  • .htm" - resx .Net resource file
  • .htm" - vb - VB.Net source file
  • .atf - Adobe Transfer Functions file / Axon Text File
  • .au - law sound file
  • .avi - Audio video file
  • .awk - AWK script file
  • .axe - AutoRoute map export file


Generated 12:02:11 on Dec 11, 2017