| a13 | ARJ Compressed Archive |
| a14 | ARJ Compressed Archive |
| a15 | ARJ Compressed Archive |
| a16 | ARJ Compressed Archive |
| a17 | ARJ Compressed Archive |
| a18 | ARJ Compressed Archive |
| a19 | ARJ Compressed Archive |
| a20 | ARJ Compressed Archive |
| a21 | ARJ Compressed Archive |
| a22 | ARJ Compressed Archive |
| a23 | ARJ Compressed Archive |
| a24 | ARJ Compressed Archive |
| a2r | KittyXplorer Encrypted Archive |
| aab | Android App Bundle Data |
| aaf | Apple Archive Format File |
| aar | Android Library Project. |
| ab | Android ADB Backup Archive |
| aba | Palm Address Book Archive |
| abu | Asus ZenFone Backup Archive |
| abu1 | Asus ZenFone Backup Archive |
| ace | WinAce Archive |
| acl | ArchiCrypt Live Secured Data |
| aclapp | Analytics Analysis App Package |
| acp | Alfresco Content Package |
| acr | Acer eRecovery Management Backup |
| 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 |
