| afa | Astrotite 200X Archive |
| afi | AOMEI Backupper Backup Archive |
| afs2 | CRIWARE AWB Package |
| afs3 | Advanced File Security 3 Encrypted Data |
| air | Adobe AIR Installation Package |
| aja | AJC Active Backup Archive |
| akt | AKT Compressed Archive |
| alz | ALZip Archive |
| ant | SPPAS Annotated Archive |
| ants | Tansee Message Transfer Backup |
| ap | Amiga WHAP Compressed Archive |
| apex | Android Pony EXpress Package |
| apk | Android Application Package |
| apk | Asustor ADM Application Package |
| apkm | Android App Bundle Mirror Archive |
| apks | Android APK Set Archive |
| aplib | aPLib Compressed Data |
| appv | App-V Virtual Application Package |
| ap_ | ADT Android Developer Package |
| arc | FreeArc Archive File |
| arc | I-DEAS Archive |
| arc | LH ARC Compressed Archive |
| arc | Norton Backup Archive |
| arc | Symbian OS Backup Archive |
| archiver | Incredible Bee Archiver Arhive |
| arduboy | Arduboy Game Package |
| arj | ARJ Compressed Archive |
| ark | PowerDesk Pro Archive |
| arn | CD Autorun Creator Package |
| arprojpkg | Spark AR Studio Project Package |
| asar | ASAR Archive |
| asdb | Asphyre Sphinx v2 Archive File |
| asec | Android Secure External Cache |
| ashbak | Ashampoo Backup Archive |
| ask | Astrotite 200X Skin Data |
