| .CAB | Microsoft Corporation | Arquivos de sistema | Windows Cabinet File | Corel WinZip 21 | Corel |
| .CAL | Newera Software Technology, Inc. | Arquivos de imagem Raster | CALS Raster File | CorelDRAW Graphics Suite | Corel |
| .CALS | Newera Software Technology, Inc. | Arquivos de imagem Raster | CALS Raster File | CorelDRAW Graphics Suite | Corel |
| .CCH | Microsoft Corporation | Arquivos miscelâneas | .NET Security Resolution Cache File | Corel Chart | Corel |
| .CCK | U.S. Department of Energy | Arquivos de dados | COMcheck Data File | CorelDRAW Graphics Suite | Corel |
| .CCX | Clickteam | Arquivos de complementos | Click & Create Extension | CorelDRAW Graphics Suite | Corel |
| .CDR | Corel | Arquivos de imagem vector | CorelDRAW Vector Image File | PaintShop Pro | Corel |
| .CDT | Sony | Arquivos de imagem de disco | CD-Text File | Corel Presentations X8 | Corel |
| .CDX | Microsoft Corporation | Arquivos de dados | Compound Index File | CorelDRAW Graphics Suite | Corel |
| .CFL | Corel Corporation | Arquivos miscelâneas | Corel Flow Flow Chart File | Corel WordPerfect | Corel |
| .CFT | Walt Disney Animation Studios | Arquivos Gráficos | CFast Graphics | CorelDRAW Graphics Suite | Corel |
| .CH3 | Harvard Graphics | Arquivos de layout de página | Harvard Graphics DOS Chart File | Corel Presentations X8 | Corel |
| .CHP | Corel Corporation | Arquivos de dados | Ventura Publisher Chapter Document | Ventura Publisher | Corel |
| .CIK | Corel | Arquivos de configuração | Corel Graphics 10 Custom Dual Tone File | CorelDRAW Graphics Suite | Corel |
| .CKO | Corel | Arquivos Gráficos | Image Mask File | Corel KnockOut 2 | Corel |
| .CLK | Corel | Arquivos de dados | Corel R.A.V.E Project File | CorelDRAW Graphics Suite | Corel |
| .CLY | Corel | Arquivos de configuração | CorelDRAW Custom Layout | CorelDRAW Graphics Suite | Corel |
| .CMD | Microsoft Corporation | Arquivos executáveis | Windows Command File | Corel WordPerfect | Corel |
| .CMP | Microsoft Corporation | Arquivos de configuração | Windows Connection Manager Profile | CorelDRAW Graphics Suite | Corel |
| .CMX | Corel | Arquivos de imagem vector | Corel Metafile Exchange Image File | Corel Presentations X8 | Corel |
| .CMY | Corel Corporation | Arquivos de dados | CorelDRAW Custom File | CorelDRAW Graphics Suite | Corel |
| .COR | Trimble Inc. | Arquivos GIS | Trimble Corrected SSF File | CorelDRAW Graphics Suite | Corel |
| .COREL WORDPERFECT DICTIONARY | Corel | Arquivos de dados | Corel WordPerfect Dictionary File | Corel WordPerfect X8 | Corel |
| .COS2 | Pinnacle Systems Inc. | Arquivos miscelâneas | Pinnacle Studio Cache File | Pinnacle Studio | Corel |
| .CPD | Adobe Systems Incorporated | Arquivos de dados | RoboHelp Cache Project Database | CorelDRAW Graphics Suite | Corel |
| .CPH | Corel | Arquivos de layout de página | Corel Print House File | Corel Print House | Corel |
| .CPI | Sony | Arquivos de vídeo | AVCHD Video Clip Information | Pinnacle Studio | Corel |
| .CPL | Microsoft Corporation | Arquivos de sistema | Windows Control Panel Item | CorelDRAW Graphics Suite | Corel |
| .CPO | Corel Corporation | Arquivos de dados | Corel Print House Data | Corel Print House | Corel |
| .CPS | Interscape | Arquivos de jogos | The Powder Toy Save File | Corel Print House | Corel |
| .CPT | Corel | Arquivos de imagem Raster | Corel Photo-Paint Image | Corel Presentations X8 | Corel |
| .CPX | Oracle Corporation | Arquivos de configuração | Oracle ADF Binding Context File | CorelDRAW Graphics Suite | Corel |
| .CRS | Open Source | Arquivos de jogos | StepMania Course File | Corel WordPerfect | Corel |
| .CRW | Canon Inc. | Arquivos Câmera Raw | Canon Raw CIFF Image File | CorelDRAW Graphics Suite | Corel |
| .CSB | Corel | Arquivos de desenvolvedor | Corel PHOTO-PAINT Script | Corel Photo-Paint | Corel |
| .CSC | Corel | Arquivos de desenvolvedor | Corel Script File | Corel Photo-Paint | Corel |
| .CSH | Adobe Systems Incorporated | Arquivos miscelâneas | Photoshop Custom Shapes File | Corel WordPerfect | Corel |
| .CSI | ContentServ | Arquivos de desenvolvedor | ContentServ Include File | Corel Photo-Paint | Corel |
| .CSV | Unknown Developer | Arquivos de dados | Comma Separated Values File | Corel Quattro Pro | Corel |
| .CSW | Corel | Arquivos de configuração | Corel WordPerfect Setup Information Data | Corel WordPerfect | Corel |
| .CT | Unknown Developer | Arquivos de jogos | Cheat Engine Cheat Table | Corel Painter | Corel |
| .CV | Microsoft Corporation | Arquivos de dados | CodeView Data File | CorelDRAW Graphics Suite | Corel |
| .CVS | Unknown Developer | Arquivos de dados | Comma Separated Values File | Corel Quattro Pro | Corel |
| .CWF | Corel Corporation | Arquivos de configuração | CorelDRAW Workspace File | CorelDRAW Graphics Suite | Corel |
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