| brb | Bryce Object Export |
| brc | WRAP Beginning Reservoir Concentration Data |
| brdf | Disney BRDF File |
| bre | Bible Reference Exporter Extracted List |
| bri | SeisWorks Bricked Seismic Data Format File |
| brn | BrainStorm Data |
| brn | Personal Brain File |
| brp | E-Sword Bible Reading Plan |
| brpx | E-Sword Bible Reading Plan |
| brres | BRRES Resource Package |
| brs | Adobe RoboHelp Browse Sequence |
| brs | WRAP Beginning Reservoir Storage Data |
| bru | Brutus Restore Data |
| brushset | Procreate Brush Set Data |
| brv | Brave Viewer Thumbnail Cache |
| brw | Calyx Point Borrower |
| bs4 | Mikogo Recorded Session |
| bsb | NOAA Nautical Charts |
| bsb | Xilinx Base System Builder Playback File |
| bsc | Balanced Scorecard Designer Data |
| bsca | IBM System/3 BSCA Data |
| bsch | Bartco VMS Message Schedule 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 |
| bsdl | Xilinx BSDL File |
| bsig | ClamAV Binary Signature |
| bsj | SpliceV Backsplice Junctions Data |
| bsk | Blaise Database BSK Data |
| bsml | Bioinformatic Sequence Markup Language Document |
| bsmx | BeerSmith Recipe Data |
| bsmz | Compressed BSML Document |
| bso | BSML Overlay Data |