| .CA2 | Embarcadero Technologies | Ontwikkelaarsbestanden | Delphi Install Disk12 File | Delphi (IDE) | Embarcadero Technologies |
| .CA5 | Embarcadero Technologies | Ontwikkelaarsbestanden | Delphi Install Disk11 File | Delphi (IDE) | Embarcadero Technologies |
| .CAP | Microsoft Corporation | Ontwikkelaarsbestanden | Network Monitor Packet Capture Data File | Microsoft Network Monitor | Microsoft Corporation |
| .CAR | Unknown Developer | Ontwikkelaarsbestanden | Car Explorer Data File | Car Explorer | Unknown Developer |
| .CAS | Autodesk, Inc. | Ontwikkelaarsbestanden | Autodesk Cascade License File | AutoCAD Architecture | Autodesk, Inc. |
| .CBA | WinAbility Software | Ontwikkelaarsbestanden | Comic Book ACE Archive | GonVisor | G.A.A. |
| .CBL | IBM | Ontwikkelaarsbestanden | COBOL Source Code File | GNU Compiler Collection (GCC) | GNU Project |
| .CBP | The Code::Blocks team | Ontwikkelaarsbestanden | Code::Blocks Project File | Code::Blocks | The Code::Blocks team |
| .CC | Don Ho | Ontwikkelaarsbestanden | C/C++ Source Code File | MacroMates TextMate | MacroMates |
| .CCC | Open Source | Ontwikkelaarsbestanden | Dev-C++ Code Completion Cache | Dev-C++ | Bloodshed Software |
| .CCN | Clickteam | Ontwikkelaarsbestanden | Compressed Multimedia Fusion File | Multimedia Fusion | Interscape |
| .CCP | Ambiera | Ontwikkelaarsbestanden | CopperCube JavaScript File | CopperCube | Ambiera |
| .CCS | YesSoftware | Ontwikkelaarsbestanden | CodeCharge Studio Project File | CodeCharge Studio | YesSoftware |
| .CD | Microsoft Corporation | Ontwikkelaarsbestanden | Visual Studio Class Diagram | Microsoft Visual Studio | Microsoft Corporation |
| .CDF | Wolfram Research | Ontwikkelaarsbestanden | Computable Document Format File | Wolfram Research CDF Player | Wolfram Research |
| .CDX | Microsoft Corporation | Ontwikkelaarsbestanden | Compound Index File | Microsoft Visual FoxPro | Microsoft Corporation |
| .CDXML | PerkinElmer | Ontwikkelaarsbestanden | ChemDraw XML File | Open Babel | Open Babel development team |
| .CFC | Adobe Systems Incorporated | Ontwikkelaarsbestanden | ColdFusion Component File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .CFG | Unknown Developer | Ontwikkelaarsbestanden | Configuration File | Microsoft Notepad | Microsoft Corporation |
| .CGI | Unknown Developer | Ontwikkelaarsbestanden | Common Gateway Interface Script | Microsoft Notepad | Microsoft Corporation |
| .CGL | Embarcadero Technologies | Ontwikkelaarsbestanden | CodeGuard Error Log File | RAD Studio | Embarcadero Technologies |
| .CH | CA Technologies | Ontwikkelaarsbestanden | Clipper Include File | Clipper | CA Technologies |
| .CHB | Microsoft Corporation | Ontwikkelaarsbestanden | OLE-DB Checkbook File | Unknown Software | Unknown Developer |
| .CI | Microsoft Corporation | Ontwikkelaarsbestanden | Windows Content Indexer Catalog File | Microsoft Windows | Microsoft Corporation |
| .CK | Ge Wang | Ontwikkelaarsbestanden | ChucK Source Code | ChucK | Ge Wang |
| .CKBX | Cricket Technology | Ontwikkelaarsbestanden | Cricket Audio XML Bank Description File | Cricket audio | Cricket Technology |
| .CKM | Bethesda Softworks | Ontwikkelaarsbestanden | Creation Kit Macro | The Elder Scrolls V: Skyrim | Bethesda Softworks |
| .CLA | Oracle Corporation | Ontwikkelaarsbestanden | Java Class Data | Java | Oracle Corporation |
| .CLASS | Oracle Corporation | Ontwikkelaarsbestanden | Java Class File | Eclipse IDE for Java Developers | The Eclipse Foundation |
| .CLJ | Open Source | Ontwikkelaarsbestanden | Clojure Source Code | Clojure | Open Source |
| .CLU | Revolution Software | Ontwikkelaarsbestanden | Broken Sword 2 Dialogue Data | Broken Sword 2 | Revolution Software |
| .CLW | Microsoft Corporation | Ontwikkelaarsbestanden | Visual C++ ClassWizard File | Microsoft Visual C++ | Microsoft Corporation |
| .CMA | Pierre Chambart, Jean-Christophe FILLIATRE and Sylvain Le Gall | Ontwikkelaarsbestanden | Applix Builder File | Camomile (Library File) | Pierre Chambart, Jean-Christophe FILLIATRE and Sylvain Le Gall |
| .CMAKE | Kitware, Inc. | Ontwikkelaarsbestanden | CMake File | CMake | Kitware, Inc. |
| .CNT | Microsoft Corporation | Ontwikkelaarsbestanden | Help Contents File | Microsoft HTML Help Workshop | Microsoft Corporation |
| .COB | IBM | Ontwikkelaarsbestanden | COBOL Source Code File | GNU Compiler Collection (GCC) | GNU Project |
| .COD | Unknown Developer | Ontwikkelaarsbestanden | Compiled Source Code | Microsoft Visual Studio | Microsoft Corporation |
| .COLA | Melvin Smith | Ontwikkelaarsbestanden | Cola Source Code File | COLA | Melvin Smith |
| .CONFIG | Unknown Developer | Ontwikkelaarsbestanden | Configuration File | Microsoft Notepad | Microsoft Corporation |
| .CP | Apple | Ontwikkelaarsbestanden | Xcode C++ Source File | Apple Xcode | Apple |
| .CPJ | NVIDIA | Ontwikkelaarsbestanden | NVIDIA CUDA Project | CUDA ToolKit | NVIDIA |
| .CPP | Open Source | Ontwikkelaarsbestanden | C++ Source Code File | Microsoft Visual Studio | Microsoft Corporation |
| .CPZ | Terry A. Davis | Ontwikkelaarsbestanden | LoseThos C+ Source File | LoseThos | Terry A. Davis |
| .CR2 | Canon Inc. | Ontwikkelaarsbestanden | Canon Digital Camera Raw Image File | CodedColor PhotoStudio | 1Stein |
| .CR5 | Campbell Scientific | Ontwikkelaarsbestanden | CRBasic Source Code File | CR300-Series Dataloggers | Campbell Scientific |
| .CR7 | Campbell Scientific | Ontwikkelaarsbestanden | CRBasic Source Code File | CR300-Series Dataloggers | Campbell Scientific |
| .CS | Microsoft Corporation | Ontwikkelaarsbestanden | C# Source Code File | Notepad++ | Don Ho |
| .CSB | Corel | Ontwikkelaarsbestanden | Corel PHOTO-PAINT Script | Corel Photo-Paint | Corel |
| .CSC | Corel | Ontwikkelaarsbestanden | Corel Script File | Corel Photo-Paint | Corel |
| .CSHRC | The Open Group | Ontwikkelaarsbestanden | Unix Command Data | GNU Emacs | GNU Project |
| .CSI | ContentServ | Ontwikkelaarsbestanden | ContentServ Include File | ContentServ CS EMMS Suite | ContentServ |
| .CSIG | Open Source | Ontwikkelaarsbestanden | SCons Content Signature | SCons | Open Source |
| .CSN | Adobe Systems Incorporated | Ontwikkelaarsbestanden | Adobe Code Snippet Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .CSP | RadGs Software | Ontwikkelaarsbestanden | Concept Server Page | Mozilla Firefox | Mozilla |
| .CSPROJ | Microsoft Corporation | Ontwikkelaarsbestanden | Visual Studio C# Project | Microsoft Visual Studio | Microsoft Corporation |
| .CST | Smith Micro Software | Ontwikkelaarsbestanden | Manga Studio Story File | Manga Studio | Smith Micro Software |
| .CSX | Microsoft Corporation | Ontwikkelaarsbestanden | Visual C# Script | Notepad++ | Don Ho |
| .CTC | Microsoft Corporation | Ontwikkelaarsbestanden | Visual Studio Command Table Configuration | Microsoft Visual Studio | Microsoft Corporation |
| .CTL | Open Source | Ontwikkelaarsbestanden | StepMania SMZIP Package Description File | StepMania | Open Source |
| .CTP | Cake Software Foundation | Ontwikkelaarsbestanden | CakePHP Template | Adobe Dreamweaver | Adobe Systems Incorporated |
| .CTX | Microsoft Corporation | Ontwikkelaarsbestanden | Visual Basic Control Binary File | Microsoft Visual Studio | Microsoft Corporation |
| .CU | NVIDIA | Ontwikkelaarsbestanden | CUDA Source Code File | Microsoft Notepad | Microsoft Corporation |
| .CUF | Borland | Ontwikkelaarsbestanden | Turbo C Utilities Form Definition | Turbo C | Borland |
| .CV4 | Microsoft Corporation | Ontwikkelaarsbestanden | Microsoft CodeView Graphics Data | CodeView | Microsoft Corporation |
| .CWL | Open Source | Ontwikkelaarsbestanden | TeXstudio Completion Word List | TeXstudio | Open Source |
| .CX | OrbiTech Ltd. | Ontwikkelaarsbestanden | CodeMapper Script | CodeMapper | OrbiTech Ltd. |
| .CXE | Sublime HQ Pty Ltd | Ontwikkelaarsbestanden | Common XML Envelope Data | Microsoft Notepad | Microsoft Corporation |
| .CXP | Omron Corporation | Ontwikkelaarsbestanden | CX-Programmer Project File | OMRON CX-One | Omron Corporation |
| .CXT | Omron Corporation | Ontwikkelaarsbestanden | CX-Programmer Project Text File | OMRON CX-One | Omron Corporation |
| .CXX | Embarcadero Technologies | Ontwikkelaarsbestanden | C++ Main Source Code File Format | Eclipse CDT | The Eclipse Foundation |
| .CYA | Peter Güntert | Ontwikkelaarsbestanden | Cyana Macro | Cyana | Peter Güntert |
| .C__ | Open Source | Ontwikkelaarsbestanden | C++ Source Code File | Microsoft Visual Studio | Microsoft Corporation |
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