| acu | Shrinkit NuFX Applelink Archive |
| adi | AOMEI Backupper Disk Backup Archive |
| adsm | Advanced Split Machine Split File |
| aes | AES Crypt Encrypted |
| 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 |
| 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 |
| arduboy | Arduboy Game Package |
| arj | ARJ Compressed Archive |
| ark | PowerDesk Pro Archive |
