| bar | dBase Application Generator Menu Bar Object |
| bas | BASIC Source |
| basex | BaseX Data |
| baz | Zebra Printer Basic Source Code |
| bb | Blitz Basic Code |
| bb | GCOV BB Data |
| bbc | BBC Basic Source Code |
| bbf | ScriptBasic Compiled Binary File |
| bbg | GCOV BBG Data |
| bbr | BlackBerry Native SDK Manifest Data |
| bc | Low Level Virtual Machine Bitcode |
| bcb | Borland C++ Builder Data |
| bcc | Borland C++ Makefile |
| bcl | PDP-10 BCPL Compiler Source Code |
| bcp | Batch Compiler Preset |
| bcw | Borland C++ Workspace Data |
| bdat | HP-UX Binary Data File |
| bdcm | Business Data Connectivity Model Data |
| bdcm | Visual Studio BDC Model Data |
| bdcr | Microsoft Visual Studio BDC Resource Data |
| bde | Borland Database Engine Data |
| bdf | Altera Quartus II Block Diagram File |
| bdh | Silk Performer Script |
| bds | EasyC Project Data |
| bdsl | Boundary-Scan Description Language File |
| bdt | TAC Script |
| bdtd | Java Binary DTD Data |
| bdx | VisionICE Flat Binary Downloadable |
| beam | Erlang Compiled BEAM File |
| ber | ASN-1Step Basic Encoding Rules Data |
| bet | BETA Source Code |
| beta | BETA Source Code |
| bfo | GT Nexus PDF Template |
| bgm | Basic4GL 3D Model |
| bgn | Xilinx Vivado Bitgen Data |
| bhtml | BabuHTML Embedded Software |
| bi | Microsoft Visual Basic Include |
| bi | OpenEdge ABL Before Image |
| bin | Crestron SIMPL Binary Output Data |
| bin3 | LabVIEW Binary Data |
| bingo | Bingo Project |
| bin_ | Emu8086 Assembly Source Code |
| birds | Bird Script Source Code |
| birt | BIRT Data |
| bkc | WebDev Class Backup Data |
| bke | WebDev Report Backup Data |
| bkg | WebDev Procedures Backup Data |
| bkh | WebDev Help Backup Data |
| bkp | WebDev Project Backup |
| bkr | WebDev Query Backup Data |
| bkt | WebDev Template Backup Data |
| bkw | WebDev Window Backup Data |
| bky | MIT App Inventor Blocks XML Data |
| bld | QuickBasic BLOAD Image |
| bld | SPLat Build File |
| bld | Xilinx ISE Build Data |
| bli | PDP-10 BLISS-10 Compiler Source Code |
| blk | ProWorx NXT Block Data File |
| blk | Win32Forth Block Data |
| bll | Delphi Localization Data |
| bltx | BlaTeX Source Code |
| bluej | BlueJ Package |
| bml | Bean Markup Language File |
| bml | Better Markup Language File |
| bml | Binary Markup Language Data |
| bmm | Xilinx PROMgen BMM Data |
| bms | QuickBMS Script |
| bmt | 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 |
| bos | IBM Rational ClearCase Build Options Specification |
| 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 |
| brs | Batchrun Batch |
| 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 |
| bsp | PBASIC Preprocessor Input |
| bspace | Amazon Lumberyard Blend Space Data |
| bsv | Bluespec System Verilog Data |
| bsx | PBASIC Preprocessor Output |
| bt | Crestron SIMPL Boot Data |
| bte | BTEWin Script |
| btf | Psion OPL Batch File |
| btl | INPRISE Format Language Library |
| 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 |
| bxl | Turbo-Basic XL Source Code |
| bxm | BasicX Variables Map |
| bytes | Unity Binary Text Asset Data |
| bzl | Bazel Extension |
| bzr | Bazaar Data |
| c | AutoCAD Development System C Source Code |
| c | C Source Code |
| c | Lite-C Script |
| c | Origin C Source Code |
| c# | Visual C# Source Code |
| c++ | C++ Source Code |
| c-- | Sphinx C-- Language Source Code |
| c3b | Cocos2d-x 3D Model Data |
| ca1 | Delphi Install Disk Data |
| caf | Amazon Lumberyard Character Animation Data |
| caf | CryENGINE Character Animation Data |
| cal | Cakewalk Application Language Script |
| caml | Core Animation Markup Language Data |
| capfile | Ruby Capistrano Instruction Data |
| car | BREW MP Component Application Resource |
| cas | Borland Combined C/Assembly Source Code |
| catscript | CATIA Script |
| catvbs | CATIA VB Script |
| cax | Amazon Lumberyard CAD Exchange Data |
| cb | BRIEF Macro File |
| cb | CoolBasic Source Code |
| cba | Creative BASIC Source Code |
| cba | CryENGINE Resource Compiler Settings Data |
| cbk | Delphi Temporary Backup |
| cbo | COMBAS Binary Object |
| cbs | Cardbox Macro Script |
| cbxml | CodeBox Library |
| cc | Visual dBASE Custom Class Data |
| ccb | CopperCube Scene File |
| ccb | Visual Basic Animated Button Configuration |
| ccbi | CocosBuilder Export File |
| ccbjs | CopperCube JavaScript File |
| ccc | Dev-C++ Code Completion Cache |
| ccdoc | IBM Rational ClearCase Doctor Data |
| ccg | GNOME C++ Source Code |
| cch | .NET Security Cache |
| ccn | Multimedia Fusion Compressed Data |
| cco | Apple Cocoa Data |
| cco | CodeCheck Object File |
| ccp | CodeCharge Studio Page |
| ccp | CopperCube Prefab Data |
| ccproj | Microsoft Azure Project |
| ccs | Visual CCScript Script |
| ccscc | ClearCase Source Control Info |
| ccx | Click and Create Extension |
| ccxml | CCXML Document |
| ccxml | TI Code Composer Studio Target Configuration |
| cd | Visual Studio Class Diagram |
| cdb | Borland Turbo C Main Database |
| cdb | µVision Device Database |
| cdf | Amazon Lumberyard Character Definition Data |
| cdm | Visual dBASE Customer Data Module |
| cdml | Claris Dynamic Markup Language Document |
| cdp | CA Visual Objects Platform Data |
| cdt | ProWorx NXT Temporary Long Comment Data |
| cdx | Alpha Five Table Index |
| cec | Windows CE Catalog Item |
| cel | CIMFast Event Language Source Code |
| cem | Windows CE Emulator Image |
| cer | Lahey Fortran Compilation Error Data |
| cesf | Ultra TC Editors Script |
| cet | Hitachi COBOL2002 Data |
| cetool | Windows CE Plugin |
| cfb | INMOS Toolset Binary Configuration Data |
| cfb | Microsoft Compound File Binary |
| cfc | ColdFusion Component File |
| cfi | CleverForm Script File |
| cfl | Microsoft Developer Studio Diagram Data |
| cfm | ColdFusion Markup Language |
| cfm | Visual dBASE Customer Form Data |
| cfo | Borland Turbo C Form Object |
| cfs | INMOS Toolset Configuration Data |
| cg | Nvidia CgFX Program |
| cga | CryENGINE Geometry Animation |
| cgf | Amazon Lumberyard Static Geometry Data |
| cgf | CryENGINE Geometry Format Data |
| cgf | ProWorx NXT Codegen Batch |
| cgfx | Nvidia CgFX Shader |
| cgi | RAD Studio CodeGuard Configuration |
| cginc | Unity Custom Shader Include |
| cgl | RAD Studio CodeGuard Log |
| cgr | Quest3D Channel Group File |
| cgt | GOLD Parser Compiled Grammar Table |
| cgvp | Nvidia Cg Toolkit XML Data |
| ch | CA-Clipper Clipper Header |
| changes | Squeak Changes Data |
| chd | Chart FX Script |
| chef | Chef Source Code |
| chh | Borland C++ Header |
| chi | C To Haskell Interface File |
| chr | Amazon Lumberyard Character Asset Data |
| chr | CryENGINE Character Data |
| chs | Haskell Source With C Hooks |
| cic | Hitachi Ladder Editor Circuit Comment |
| ciq | CONNX InfoNaut Query |
| cjs | CommonJS Script |
| ck | ChucK Source Code |
| ckbx | Cricket Audio XML Bank Description |
| ckm | Creation Kit Macro |
| cko | Kokogut C Output File |
| ckp | Microsoft SQL Server Checkpoint Data |
| ckx | ChucK Plugin |
| cl | OpenCL Kernel |
| cla | Clarion for DOS Source Code |
| class | Gambas V2 Class Data |
| classpath | Eclipse IDE JAVA Project Classpath Data |
| clb | Code Librarian Database |
| clips | Coda Clips Data |
| clj | Clojure Source Code |
| cljc | Clojure Macros Code |
| cljs | ClojureScript Source Code |
| cljx | Clojure Portable Code |
| clog | MPI Parallel Environment CLOG |
| cloud | Crestron SIMPL Cloud Data |
| cls | Visual Basic Class Module |
| clw | Clarion Source Code |
| clw | Visual Studio ClassWizard Data |
| clz | Crestron SIMPL Library Data |
| cmake | CMake Script |
| cmbx | SharpDevelop Combine File |
| cmc | Crestron SIMPL Module |
| cmd | PTC Creo CL Commands Data |
| cmi | OCaml Compiled Interface |
| cml | ProWorx NXT Comment Data |
| cmn | Visual Studio Windows CE Build Settings |
| cmo | OCaml Compiled Bytecode |
| cmt | OCaml CMT Data |
| cmxa | OCaml Library |
| cntk | Microsoft CNTK Data |
| cnut | Squirrel Compiled Bytecode |
| cob | COBOL Source Code |
| cobol | Micro Focus COBOL Source Code |
| cod | dBase IV Template Source |
| cod | µVision Complete Program Listing Data |
| codaplugin | Coda Plug-in |
| codasite | Coda Site Data |
| cof | Common Object File |
| cof | MPLAB IDE COF File |
| coffee | CoffeeScript JavaScript File |
| cola | Cola Language Source Code |