| bi | OpenEdge ABL Before Image |
| bin | Crestron SIMPL Binary Output Data |
| bin | Windows CE Emulator Image |
| bin3 | LabVIEW Binary Data |
| bin_ | Emu8086 Assembly Source Code |
| birt | BIRT Data |
| bld | SPLat Build File |
| bli | PDP-10 BLISS-10 Compiler Source Code |
| blk | ProWorx NXT Block Data File |
| blk | Win32Forth Block Data |
| bltx | BlaTeX Source Code |
| bluej | BlueJ Package |
| bml | Alpha Five Image Library |
| bmt | Alpha Five Image Library |
| bmx | Alpha Five Image Library |
| bo | BSC Intermediate Object |
| boc | Hitachi Ladder Editor Box Comment |
| bog | Niagara Ax BOG FIle |
| bok | ProStores Dynamic Web Page |
| boot | InstallShield Boot File |
| borland | Borland C Makefile |
| bpg | Borland Project Group |
| bpi | Borland Package Import |
| bpk | Borland Package |
| bpl | Borland Package Library |
| bql | SensorBee BQL Script |
| br | Omnis Studio Data File |
| brc | BASIS Binary Resource Data |
| brh | BREW Application Resource Header File |
| browser | ASP.NET Browser Definition |
| brx | BREW Application Resource File |
| bs2 | BASIC Stamp 2 Code |
| bsave | QuickBasic BLOAD/BSAVE Data |
| bsc | Visual Studio Browser Information |
| bsf | Altera Quartus II Block Symbol File |
