| bass | Tekla Structures Bolt Assembly Data |
| battle | Robocode Battle Data |
| bav | The Bat! Anti-Virus Plugin |
| baw | BrainLED AlfaWave Session |
| bb | DVIPDFM Output Data |
| bbd | Xilinx Black Box Definition |
| bbfw | iTunes Firmware Update |
| bbi | LinkOne Publisher Book Data |
| bbj | BuilderUI Batch Job |
| bbk | Sage Fixed Assets Database Backup |
| bbk | Treepad Database Blob Backup |
| bbl | E-Sword Bible Data |
| 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 | Adobe Bridge Cache Data |
| bc | BitComet File |
| bc | Sierra Print Artist Business Card |
| bc! | BitComet File |
| bc2 | Blue Kenue Boundary Conditions Data |
| bc3 | FIEBDC Database |
| bc4 | CoStar Barcode Label Data |
