Computer file extensions - A
Updated: 01/31/2023 by Computer Hope
Below is a listing of each of the different file extensions that begin with the letter "A." If you are looking for a file extension that starts with a different letter, click the corresponding beginning letter below.
| A | |
|---|---|
| .A | ADA program file or Unix library. |
| .A3W | Macromedia Authorware 3.5 file. |
| .ABK | Autobackup file used with CorelDRAW 6 and above. |
| .ABM | 1.) Album for digital music, including songs. 2.) Album containing references to pictures in a digital music album. |
| .ABR | Brush file for Adobe Photoshop. |
| .ACE | WinAce compressed file. |
| .ACR | File format for medical images. |
| .ACT | Adobe Photoshop color table file. |
| .AD | After Dark file or a Microsoft Access point file. |
| .ADF | Adapter description files. |
| .ADM | After Dark screen saver module. |
| .ADP | Microsoft Access project. |
| .ADR | After Dark randomizer or Opera browser bookmark backup. |
| .AI | Adobe Illustrator file. |
| .AIF | AIFF (Auto Interchange File Format) audio file. |
| .AIR | Adobe AIR software installation file. |
| .ANI | Windows animated mouse cursor file. |
| .ALX | ActiveX layout file or BlackBerry application loader file. |
| .ANS | ANSI (American National Standards Institute) text file. |
| .APK | Android application package. |
| .ARC | Short for archive, .ARC was an early compressed file format. |
| .ARJ | Compressed file extracted and used with various compression utilities. |
| .ARK | Short for archive, .ARK was an early compressed file format. |
| .AS | Short for AppleSingle, .AS is a compressed file extracted and used with various compression utilities. |
| .ASC | ASCII (American Standard Code for Information Interchange) text file. |
| .ASE | 1.) Adobe Swatch Exchange file, used by Adobe InDesign and Adobe Illustrator. 2.) File created by Aseprite software, containing a sprite. |
| .ASF | Sort for Advanced Streaming Format, file developed by Microsoft. The .ASF file is generally a movie player and can be open with software such as Windows Media Player. |
| .ASL | Adobe Photoshop file containing style data, to be applied to layers or objects. |
| .ASP | Microsoft Active Server Pages. To open these files, use your Internet browser. |
| .ASX | Media playlist file, or file containing shortcuts to media files. Used by Windows Media Player and other media players. |
| .ATO | Compaq Just Burn file. |
| .ATY | 3D Topicscape association type after export to Windows. |
| .AU | Sun and NeXT audio file. |
| .AVI | Microsoft Windows movie file. See avi page for further information. |
| .AXX | AxCrypt encrypted file. |
| .AZW | An eBook formatted for a Kindle device. |