| .am5 |
AutoPlay Media Studio 5 Project File |
| .arr |
Amber Graphic File |
| .apr |
ArcView Project File |
| .artproj |
Artifacts Project |
| .alb |
Alpha Five Library |
| .adb |
Ada Body File |
| .asi |
Grand Theft Auto Mod Library |
| .axe |
AutoRoute Map File |
| .addin |
Visual Studio Add-in Definition File |
| .aia |
MIT App Inventor Source Code File |
| .aps |
Visual C++ Resource File |
| .as2proj |
FlashDevelop ActionScript 2 Project File |
| .acp |
Alfresco Content Package |
| .arsc |
Android Package Resource File |
| .autoplay |
AutoPlay Media Studio Project File |
| .alp |
Ableton Live Pack File |
| .ab |
Android ADB Backup File |
| .aml |
ACPI Machine Language File |
| .ap_ |
ADT Android Developer Package |
| .ane |
Adobe AIR Native Extension |
| .appx |
Windows 8 App Package |
| .appxupload |
Windows 8 App Upload Package |
| .asvf |
Asphyre Sphinx Archive File |
| .aidl |
Android Interface Definition Language File |