| backpack | Mammoet Backpack Word List |
| backup | pgAdmin Database Backup |
| backupdb | Time Machine Backup Folder |
| bad | Brutus Application Definition |
| bad | DataFlex Bad File |
| bad | Microsoft Exchange Non-Delivery Report Message |
| bada | Bada Data |
| badongo | Badongo File Info |
| baf | Pioneer DJS Interface Data |
| bafl | BurnAware File List |
| bag | AOL Instant Messenger Buddy List File |
| bag | PMMail Mail Index |
| baggage | InstallAware Setup Dialog Baggage |
| bai | Bank Administration Institute Data File |
| bai2 | Bank Administration Institute Version 2 Data |
| bak | AcqURL Bookmark Database Backup |
| bak | MRDS Database Backup |
| bak | TBK Tracker Deleted Course INI |
| bak | VoCATS Modified Test Backup |
| baka | eXtendable Wad Editor BAKA Data |
| bak~ | AbiWord Auto-Saved Document |
| bam | SpliceV BAM Data |
| ban | MegaHAL Banned Words List |
| ban | Sierra Print Artist Banner |
| banana | Banaranama Question Export Data |
| bap | Blaze Audio Wave Information |
| bap | Visage Mpeg-4 ASCII Body Animation Parameters File |
| baroc | IBM Tivoli Enterprise Console Adapter Description |
| bartco | Bartco VMS Message Data |
| bas | ALEID2000 Basic Data |
