| 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 |
| capfile | Ruby Capistrano Instruction Data |
| car | BREW MP Component Application Resource |
| catscript | CATIA Script |
| catvbs | CATIA VB Script |
| cax | Amazon Lumberyard CAD Exchange Data |
| cb | BRIEF Macro File |
| cbl | COBOL Source Code |
| cbo | COMBAS Binbary Object |
| cbs | Cardbox Macro Script |
| cbxml | CodeBox Library |
