| arduboy | Arduboy Game Package |
| arj | ARJ Compressed Archive |
| ark | PowerDesk Pro Archive |
| arn | CD Autorun Creator Package |
| arprojpkg | Spark AR Studio Project Package |
| arv | Eschalon Setup Archive |
| asar | ASAR Archive |
| asdb | Asphyre Sphinx v2 Archive File |
| asec | Android Secure External Cache |
| ashbak | Ashampoo Backup Archive |
| ask | Astrotite 200X Skin Data |
| aspk | My APK App Backup Package |
| asr | Asura Engine Audio Streaming Archive |
| asvf | Asphyre Sphinx v1 Archive File |
| ate | Microsoft Accounting Accountants Transfer |
| ati | Microsoft Accounting Import |
| atlas | Exient XGS Atlas Archive |
| avastsounds | Avast Antivirus Sound Package |
| avasttheme | Avast Antivirus Theme Data |
| avgsounds | AVG Internet Security Sound Package |
| awb | CRIWARE AWB Package |
| awi | AIM Widget Package |
| aza | ProSystem fx Engagement Admin Package |
| azp | ProSystem fx Engagement Binder Package |
| b1 | B1 Compressed Archive |
| b6z | B6Zip Archive |
| ba | Scifer External Header Archive |
| backup | Android Backup Data |
| baklz4 | Mozilla Firefox Compressed Backup |
| balz | BALZ Compressed Archive |
| bar | BlackBerry 10 Application Package |
| bbb | BlackBerry Mobile Phone Backup |
| bbtheme | phpBB Theme Package |
| bc | Big Crunch Compressed Data |
| bca | Jetico BCArchive Encrypted Archive |
| bcpio | Binary CPIO Archive |
| bcsar | Nintendo 3DS BCSAR Audio Archive |
| bee | BeeGui Bee Archiver Archive |
| bel | HPXView Binary Event Log Archive |
| bfa | Blowfish Advanced CS Encrypted File |
| bff | AIX Backup File Format |
| bh | BlakHole Archive |
| bhx | BinHex Encoded Archive |
| bio | BioArc Compressed Archive |
| bkc | Backup4all Backup Catalog |
| bkf | Windows NT Backup Archive |
| bko | BackupOutlook Backup Archive |
| bkp | Zapback Backup Archive |
| bkpi | Synology Hyper Backup Image |
| bks | Windows NT Backup Selection |
| bkz | TeKton3D Project Archive Backup |
| bldl | BenchLink Data Logger 3 Package |
| bli | Blink Archive |
| blz | BriefLZ Compressed Data |
| bma | BMA Archiver Compressed Archive |
| bm_ | Compressed Microsoft BMP Image |
| bnh | BinHex Encoded Archive |
| bnhq | BinHex Encoded Archive |
| bny | Binary II Data |
| boa | BOA Constrictor Compressed Archive |
| boxer | Boxer for Mac Game Archive |
| boz | BZIP Over ZIP Compressed Archive |
| bqy | Binary II Data |
| Shrinkit NuFX Archive with BLU Header |
| br | Brotli Compressed File |
| br1 | Total Commander Cached Button Bar Icons |
| br2 | Total Commander Cached Button Bar Icons |
| brainzip | Personal Brain v6 BrainZip Archive |
| PersonalBrain Mind Map Archive |
| bsc | BINSCII Archive |
| bsq | BINSCII Archive |
| btc | Becker Tools Compressed Archive |
| btinstall | uTorrent Install Package |
| bu | SAP Business One BackUp Data |
| bulk | BulkZip Compressed Archive |
| bulk-001 | BulkZip Splitted Archive |
| bulk-002 | BulkZip Splitted Archive |
| bulk-003 | BulkZip Splitted Archive |
| bulk-004 | BulkZip Splitted Archive |
| bulk-005 | BulkZip Splitted Archive |
| bundle | Git Bundle Archive |
| bxpck | BoxedApp Package |
| bxy | Shrinkit NuFX Archive with Binary II Header |
| bz | BZip Compressed Data |
| bz2 | BZip2 Compressed Data |
| bza | IZArc BGA Archive |
| bzip | BZip Compressed Data |
| bzip2 | BZip2 Compressed Data |
| bzp | ProSystem fx Engagement Binder Backup Package |
| bzp2 | BZip2 Compressed Data |
| c00 | WinAce Archive |
| c000 | Genie Backup Manager Compressed Split Backup Archive |
| c01 | WinAce Archive |
| c02 | WinAce Archive |
| c03 | WinAce Archive |
| c04 | WinAce Archive |
| c05 | WinAce Archive |
| c06 | WinAce Archive |
| c07 | WinAce Archive |
| c08 | WinAce Archive |
