| brn | BrainStorm Data |
| brp | E-Sword Bible Reading Plan |
| brp | Bryce Brush Data |
| brpx | E-Sword Bible Reading Plan |
| brres | BRRES Resource Package |
| brs | Adobe RoboHelp Browse Sequence |
| brs | WRAP Beginning Reservoir Storage Data |
| brstmspm | eXtendable Wad Editor BRSTMSPM Data |
| brt | Bryce Texture Data |
| bru | Brutus Restore Data |
| brushset | Procreate Brush Set Data |
| brv | Brave Viewer Thumbnail Cache |
| brw | Calyx Point Borrower |
| bs4 | Mikogo Recorded Session |
| bs7 | Windows 7 Boot Updater Skin |
| bsb | Xilinx Base System Builder Playback File |
| bsb | SWAT Sub-basin Output Data |
| bsb | NOAA Nautical Charts |
| 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 |
| bsig | ClamAV Binary Signature |