| csp | SAP Business Objects Crystal Server Page |
| cspkg | Microsoft Azure Service Package |
| csq | Microsoft Visual FoxPro Client-Server Query File |
| cst | ContentServ CS EMMS Template |
| csx | Visual C# Script |
| ctc | Visual Studio Command Table Configuration |
| ctf | MATLAB Component Technology File |
| ctl | PDP-10 Batch File |
| Visual Basic User Control Text |
| cto | Visual Studio Binary Command Table Output |
| ctp | BestAddress HTML Editor Combined Template |
| CakePHP Template |
| ctrace | Android System Trace Data |
| ctrl | Oracle WebLogic Workshop Controls |
| cts | ABC Permanent Locations Data |
| ctsym | Visual Studio Command Table Symbols File |
| ctx | Visual Basic User Control Binary Data |
| ctxt | BlueJ Context File |
| cu | CUDA Source Code |
| cuf | Turbo C Utilities Form Definition |
| cuh | CUDA Header |
| cuo | CUDA Object |
| curl | Curl Applet |
| cus | ConciseURI Syntax Data |
| cv | Microsoft CodeView Data |
| cv4 | Microsoft CodeView Graphics Data |
| cvb | Borland Database Engine Internationalization Data |
| cvip | NI LabWindows/CVI Profiler Data |
| cvsignore | CVS Ignore File |
| cvsrc | CVS Configuration Data |
| TortoiseCVS CVS Commands File |
| cweb | CWEB Source Code |
| cwlink | CodeWarrior Link Data |
| cwm | IBM WebSphere Map Designer Express Map Definition |
| cwproj | C Omega Project |
| Clarion 7 Project |
| cx | Codemapper Script |
| cxx | C++ Source Code |
| cy | Cycript Source Code |
| d | D Source Code |
| Dialect Source Code |
| GCC Dependency File |
| d2wmodel | WebObjects Web Script |
| d4 | Dataphor Source Code |
| d43 | IAR System MSP430 Debug Data |
| d4c | Dataphor Catalog Data |
| da | Gcov Compiled Output |
| Gcov Data File |
| dabriefcase | RemObjects Data Abstract File Briefcase |
| daconfig | RemObjects Data Abstract Configuration |
| daconnections | RemObjects Data Abstract Connections Data |
| dacpac | Microsoft SQL Server Data Tier Application Package |
| dad | RemObjects Delphi Data Abstract Driver |
| dadiagrams | RemObjects Data Abstract Data Diagrams |
| dadx | Eclipse Document Access Definition Extension |
| dart | Dart Source Code |
| das | Atari Jaguar DSP Assembly Source |
| daschema | RemObjects Data Abstract Schema |
| dat | GameMaker Studio Audio Data Package |
| datasource | Microsoft Visual Studio Data Source |
| db | Atari Jaguar Debugger Script |
| db2sp | Visual Studio DB2 Create Procedure Statement Data |
| db2tbl | Microsoft Visual Studio DB2 Table Script |
| db2tr | Microsoft Visual Studio DB2 Trigger Script |
| db2udf | Visual Studio DB2 User Defined Function Data |
| db2vw | Microsoft Visual Studio DB2 View Script |
| dba | Amazon Lumberyard Animation Database |
| CryENGINE Animation Data |
| DarkBASIC Source Code |
| Visual Prolog Database |
| dbag | WinSQL DataBag Data |
| dbd | Modula-2 Debug Data |
| dbf | Alpha Five Table Data |
| Microsoft Visual FoxPro Database Table |
| dbg | IAR System XLink Debug Data |
| Microsoft Visual Studio Debug File |
| dbgdt | IAR System Debugger Desktop Data |
| dbgsym | Pidgin IM Debug Symbols Data |
| dbi | Data Explorer Information |
| dbk | DocBook Source Code |
