Browse File Extensions by Alphabet

Every File Extension in the World -- almost!

This is a resource for looking up file extension names or suffixes. By browsing alphabetically, you will be able to find the format you are looking for and learn what program it is associated with. In general, if you have the program that uses that file extension, that program can be used to open or otherwise use the file.

You will also find a handy link on each file extension page that will allow you to ask IT Knowledge Exchange members for more information about the file you are looking up. 

Many people have contributed to this ever-growing list and we thank them! If you know of a file extension that should be added to this list, please e-mail us and we'll add it.

A - A4M

    • A - Archive file
    • A - Hellhog XP game archive
    • A - Library file (Unix)
    • A - UNIX Static Object Code Library
    • A - Free Pascal Archive File for Linux or DOS Version
    • A - Jabbim ( Jabber client ) file
    • A - Assembly source code
    • A - UNIX Archive Library
    • A - Static Library
    • A - ADA Program
    • A - Object code library
    • A - Ada programming language source code file
    • A - ADA source code file
    • A00 - Part of an Archive
    • A00 - ALZip Second Split Archive File
    • A01 - Archive Segment ( part 1)
    • A01 - ALZip Third Split Archive File
    • A01 - Part of an Archive
    • A01 - OzWin CompuServe E- mail file
    • A02 - ALZip Fourth Split Archive File
    • A02 - Archive Segment ( part 2)
    • A02 - Split Multi - volume ARJ compressed file archive ( part 4)
    • A02 - OzWin CompuServe E- mail / Forum Access SYSOP File
    • A03 - OzWin CompuServe E- mail / Forum Access SYSOP File
    • A03 - Archive Segment ( part 3)
    • A03 - Split Multi - volume ARJ compressed file archive ( part 5)
    • A03 - annotare ava 04 Project File ( annotare.net)
    • A04 - Archive Section
    • A04 - Part of an Archive
    • A04 - OzWin CompuServe E- mail file
    • A05 - OzWin CompuServe e- mail file
    • A05 - Part of an Archive
    • A05 - Archive Section
    • A06 - OzWin CompuServe E- mail file
    • A06 - Lotto Pro 2002 smart number ticket file
    • A06 - Part of an Archive
    • A06 - Archive Section
    • A07 - OzWin CompuServe E- mail file
    • A07 - Archive Section
    • A07 - Part of an Archive
    • A07 - TaxCalc Tax File ( Acorah Software Products Ltd.)
    • A08 - Part of an Archive
    • A08 - OzWin CompuServe E- mail file
    • A08 - Archive Section
    • A09 - Part of an Archive
    • A09 - OzWin CompuServe E- mail file
    • A09 - Archive Section
    • A1 - Free Pascal Archive File for GO321v1 Platform (FPC Development Team )
    • A1 - Unknown Apple II File
    • A10 - Split Multi - volume ARJ compressed file archive ( part 12)
    • A10 - OzWin CompuServe E- mail file
    • A11 - Split Multi - volume ARJ compressed file archive ( part 13)
    • A11 - AOL Instant Messenger graphic file
    • A11 - AIIM image
    • A12 - Split Multi - volume ARJ compressed file archive ( part 14)
    • A13 - Split Multi - volume ARJ compressed file archive (p
    • A14 - Split Multi - volume ARJ compressed file archive ( part 16)
    • A15 - Split Multi - volume ARJ compressed file archive ( part 17)
    • A16 - Split Multi - volume ARJ compressed file archive ( part 18)
    • A17 - Split Multi - volume ARJ compressed file archive ( part 19)
    • A18 - Split Multi - volume ARJ compressed file archive ( part 20)
    • A19 - Split Multi - volume ARJ compressed file archive ( part 21)
    • A20 - Split Multi - volume ARJ compressed file archive ( part 22)
    • A21 - Soundweb Firmware File (BSS Audio )
    • A2A - Sharp APL workspace export file
    • A2A - IBM Voice Type languages vocabels file
    • A2A - IBM Voice Type Language Vocabels File
    • A2A - APLASCII EISPACK file
    • A2B - A2B Player playlist
    • A2B - A2B Player Playlist ( DigitalPhono.com)
    • A2C - Alice Scene File ( Carnegie Mellon University )
    • A2C - Alice Scene file
    • A2FC - Image Apple IIe / Apple IIc Double Hi-Res 16 writes 16 colors
    • A2HR - Image Apple II+ single Hi-Res writes 2 colors
    • A2LC - Image Apple II+ Single Hir-Res 8 writes 8 colors
    • A2M - AdLib Tracker 2 File
    • A2M - AdLib Tracker 2
    • A2M - AudioToMidi settings file
    • A2M - SAM alignment file
    • A2P - Astrotite Online Data repair file
    • A2R - KittyXplorer Encrypted Archive ( MyPlanet Software )
    • A2W - Alice Program ( World ) File ( Carnegie Mellon University )
    • A2W - Alice World
    • A3 - Unrelated Inventions Audiotools Show Log
    • A3 - Unrelated Inventions Audiotool file
    • A3 - FreeBSD file
    • A31 - Adobe Authorware library file
    • A31 - Authorware Ver. 3.x Library ( Adobe Systems Incorporated )
    • A3D - Amapi 3D Modeling ( Eovia )
    • A3D - Amapi 3D modeling
    • A3K - Yamaha A3000 Sampler File ( Yamaha Corporation of America )
    • A3K - Yamaha A3000 sampler file
    • A3L - Authorware 3.x library
    • A3M - Authorware MacIntosh file (unpackaged)
    • A3S - Autodesk 3D scene file
    • A3W - Authorware Windows file (unpackaged)
    • A41 - Authorware Ver. 4.x Library ( Adobe Systems Incorporated )
    • A41 - Adobe Authorware library file
    • A4L - Authorware 4.x library
    • A4M - Authorware MacIntosh file (unpackaged)