| .axt |
Adobe Photoshop Extract File |
| .aia |
MIT App Inventor Source Code File |
| .aetx |
After Effects XML Project Template |
| .aggr |
Adobe Captivate Aggregate File |
| .abf |
Adobe Binary Screen Font File |
| .acf |
Steam Application Cache File |
| .atf |
Axon Text File |
| .adpp |
Adobe Device Profile Package |
| .advs |
Adobe Device Central Device Set |
| .arcut |
Prelude Rough Cut File |
| .ars |
After Effects Render Settings File |
| .aom |
After Effects Output Module |
| .ane |
Adobe AIR Native Extension |
| .an |
Adobe Edge Animate Project File |
| .aaui |
Acrobat User Interface File |
| .asv |
Finale Auto-save File |
| .anh |
Project ROME File |
| .a7p |
Authorware 7 Project |
| .a7r |
Authorware 7 Runtime File |
| .api |
Adobe Photoshop Inks File |
| .a5l |
Authorware 5 Library |
| .a65 |
Authorware 6.5 File |
| .acrodata |
Acrobat Data File |
| .apm |
Aldus Placeable Metafile Image |