| 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 |
| bsh | BeanShell Script |
| bspace | Amazon Lumberyard Blend Space Data |
| bsx | PBASIC Preprocessor Output |
| bt | Crestron SIMPL Boot Data |
| bte | BTEWin Script |
| btq | Basic Teradata Query Script |
| build | NAnt Build Tool Data |
| buildpath | Eclipse IDE Build Path Data |
| bur | BuRg3r Source Code |
| bwx | HP BridgeWorks Data |
| bxb | BasicX Compiled Bytecode |
| bxm | BasicX Variables Map |
| bytes | Unity Binary Text Asset Data |
| bzl | Bazel Extension |
| bzr | Bazaar Data |
| c | C Source Code |
| c++ | C++ Source Code |
| c-- | Sphinx C-- Language Source Code |
| c3b | Cocos2d-x 3D Model Data |
| ca | Core Animation Markup Language Data |
| caf | Amazon Lumberyard Character Animation Data |
| caml | Core Animation Markup Language Data |
