| brushvariant | Corel Painter Brush Variant Data |
| brv | Brave Viewer Thumbnail Cache |
| brw | Calyx Point Borrower |
| brw | PhotoCool Thumbnail Cache |
| bs4 | Mikogo Recorded Session |
| bs7 | Windows 7 Boot Updater Skin |
| bsb | NOAA Nautical Charts |
| bsb | SWAT Sub-basin Output Data |
| bsb | Xilinx Base System Builder Playback File |
| bsc | Balanced Scorecard Designer Data |
| bsca | IBM System/3 BSCA Data |
| bsch | Bartco VMS Message Schedule Data |
| bscomp | Bootstrap Studio Component Data |
| bscs | Balanced Scorecard Designer Data |
| bsct | Balanced Scorecard Designer Strategy Data |
| bsd | FacetWin Backup Set Description |
| bsd | Xilinx BSDL File |
| bsdf | Zemax Scattering Distribution Data |
| bsdiff | Binary DIFF Data |
| bsdl | Xilinx BSDL File |
| bse | CRiSP Harvest Base Data |
| bsig | ClamAV Binary Signature |
| bsj | SpliceV Backsplice Junctions Data |
| bsk | Blaise Database BSK Data |
| bsk | Bryce Skies Data |
| bsml | Bioinformatic Sequence Markup Language Document |
| bsmx | BeerSmith Recipe Data |
| bsmz | Compressed BSML Document |
| bsn | SWAT Basin Input Data |
| bso | BSML Overlay Data |
