| 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 |
