| .C4 | Northrop Grumman Corporation | Fichiers Raster Image | JEDMICS Image File | Trix DrawingCenter | Trix Systems |
| .CA1 | Piotr Fusik | Fichiers Raster Image | CrackArt Picture Image | Recoil | Piotr Fusik |
| .CA3 | Casio Computer Co., Ltd. | Fichiers Raster Image | Casio WK-1800 Save All Data | WK-1800 | Casio Computer Co., Ltd. |
| .CAL | Newera Software Technology, Inc. | Fichiers Raster Image | CALS Raster File | Adobe Photoshop | Adobe Systems Incorporated |
| .CALS | Newera Software Technology, Inc. | Fichiers Raster Image | CALS Raster File | Adobe Photoshop | Adobe Systems Incorporated |
| .CAM | Ucamco | Fichiers Raster Image | Gerber CAM Job File | CadSoft EAGLE | Autodesk, Inc. |
| .CAN | Canon Inc. | Fichiers Raster Image | Canon Navigator Fax File | Canon MP Navigator | Canon Inc. |
| .CARD | GameHouse | Fichiers Raster Image | Funkiball Adventure Game File | Funkiball Adventure | GameHouse |
| .CCH | Microsoft Corporation | Fichiers Raster Image | .NET Security Resolution Cache File | Microsoft .NET Framework | Microsoft Corporation |
| .CCI | Piotr Fusik | Fichiers Raster Image | Champions' Interlace Compressed Picture Image | Recoil | Piotr Fusik |
| .CCRF | Calcomp | Fichiers Raster Image | Calcomp Raster Bitmap Image File | ArcView | ESRI |
| .CDC | Autodesk, Inc. | Fichiers Raster Image | AutoCAD DesignCenter Preview Cache File | Autodesk AutoCAD | Autodesk, Inc. |
| .CDG | Open Source | Fichiers Raster Image | Compact Disc Plus Graphics Image | Nullsoft Winamp | Nullsoft |
| .CE | Digital Vision | Fichiers Raster Image | ComputerEyes Image | XnView MP | XnSoft |
| .CHART | Interscape | Fichiers Raster Image | Feedback Chart File | Microsoft Notepad | Microsoft Corporation |
| .CHE | Procedimientos-Uno, S.L. | Fichiers Raster Image | CHwinEHE Project Files | CHwinEHE | Procedimientos-Uno, S.L. |
| .CID | Omar F. Reis | Fichiers Raster Image | Navigator Software Chart Image Description File | Navigator | Omar F. Reis |
| .CIN | Kodak | Fichiers Raster Image | Kodak Cineon Bitmap File | Adobe SpeedGrade | Adobe Systems Incorporated |
| .CIT | Intergraph Corporation | Fichiers Raster Image | Intergraph Bitmap Image File | Intergraph SG&I software | Intergraph Corporation |
| .CLIP | CELSYS | Fichiers Raster Image | Clip Studio Format File | CELSYS Clip Studio Paint Pro | CELSYS |
| .CMP | Microsoft Corporation | Fichiers Raster Image | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .CMR | CMA Coach | Fichiers Raster Image | Coach Results File | CMA Coach | CMA Coach |
| .CPC | Cartesian Products, Inc. | Fichiers Raster Image | CPC Compressed Image File | Internet Explorer | Microsoft Corporation |
| .CPD | Adobe Systems Incorporated | Fichiers Raster Image | RoboHelp Cache Project Database | Adobe RoboHelp | Adobe Systems Incorporated |
| .CPS | Interscape | Fichiers Raster Image | The Powder Toy Save File | The Powder Toy | Interscape |
| .CPT | Corel | Fichiers Raster Image | Corel Photo-Paint Image | Corel Presentations X8 | Corel |
| .CPX | Oracle Corporation | Fichiers Raster Image | Oracle ADF Binding Context File | Oracle JDeveloper | Oracle Corporation |
| .CSF | Intergraph Corporation | Fichiers Raster Image | GeoMedia Coordinate System File | Intergraph GeoMedia | Hexagon Geospatial |
| .CT | Unknown Developer | Fichiers Raster Image | Cheat Engine Cheat Table | Cheat Engine | Open Source |
| .CUT | Various Developers | Fichiers Raster Image | Dr. Halo Bitmap Image File | Lemkesoft GraphicConverter | Lemkesoft |
| .CVP | Symantec Corporation | Fichiers Raster Image | WinFax Cover Page | WinFax | Delrina |
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