| .awd |
Award BIOS Update File |
| .abc |
ActionScript Byte Code File |
| .ajp |
CCTV Video File |
| .act |
ADPCM Compressed Audio File |
| .aud |
Video Game Compressed Audio File |
| .adx |
Approach Index File |
| .adm |
Portfolio Admin-Level Access Flag |
| .abbu |
Address Book Backup |
| .ascx |
ASP.NET User Control File |
| .akp |
Akai Sampler File |
| .ams |
Adobe Monitor Setup File |
| .a6p |
Authorware 6 Program |
| .ab3 |
PhotoImpact 3 Album File |
| .ar |
Midtown Madness Data File |
| .age3sav |
Age of Empires 3 Save File |
| .acfm |
Adobe Composite Font Metrics File |
| .amfm |
Adobe Multiple Font Metrics File |
| .ahl |
eMule Metadata File |
| .au3 |
AutoIt v3 Script |
| .afp |
Advanced Function Presentation File |
| .ac |
Autoconf Script |
| .avb |
Avid Bin File |
| .aep |
After Effects Project File |
| .acl |
AutoCorrect List File |