| baggage | InstallAware Setup Dialog Baggage |
| bai | Bank Administration Institute Data File |
| bai2 | Bank Administration Institute Version 2 Data |
| bam | SpliceV BAM 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 |
| bas | MODFLOW Basic Package |
| base | BioArray Software Environment Data |
| base64 | Base64 Encoded Data |
| bash_history | Bash History Data |
| basin | HEC-HMS Basin Model Settings |
| bass | Tekla Structures Bolt Assembly Data |
| battle | Robocode Battle Data |
| bav | The Bat! Anti-Virus Plugin |
| baw | BrainLED AlfaWave Session |
| bbd | Xilinx Black Box Definition |
| bbi | LinkOne Publisher Book Data |
| bbk | Sage Fixed Assets Database Backup |
| bbk | Treepad Database Blob Backup |
| bbli | E-Sword Bible Module |
| bblx | E-Sword Bible Data |
| bbma | BonziBuddy Data |
| bbox | Geomview Simple Bounding Box Data |
| bbp | Geomview Bezier Bicubic Patches Data |
| bbq | BitBeamer Transfer Queue Data |
| bbt | BTwin Database |
| bbv | PPLive Cache File |
| bbw | Band-in-a-Box Interface |
| bbx | BrainBox Neural Net Data |
| bbz | BerryBuzz Backup Data |
| bc | BitComet File |
| bc! | BitComet File |