| .CAL | Newera Software Technology, Inc. | File con immagini raster | CALS Raster File | CorelDRAW Graphics Suite | Corel |
| .CALS | Newera Software Technology, Inc. | File con immagini raster | CALS Raster File | CorelDRAW Graphics Suite | Corel |
| .CCK | U.S. Department of Energy | File di dati | COMcheck Data File | CorelDRAW Graphics Suite | Corel |
| .CCX | Clickteam | File con plugin | Click & Create Extension | CorelDRAW Graphics Suite | Corel |
| .CDR | Corel | File con immagini vettoriali | CorelDRAW Vector Image File | CorelDRAW Graphics Suite | Corel |
| .CDT | Sony | File con immagini disco | CD-Text File | CorelDRAW Graphics Suite | Corel |
| .CDX | Microsoft Corporation | File di dati | Compound Index File | CorelDRAW Graphics Suite | Corel |
| .CFT | Walt Disney Animation Studios | File grafici | CFast Graphics | CorelDRAW Graphics Suite | Corel |
| .CIK | Corel | File di settaggi | Corel Graphics 10 Custom Dual Tone File | CorelDRAW Graphics Suite | Corel |
| .CLK | Corel | File di dati | Corel R.A.V.E Project File | CorelDRAW Graphics Suite | Corel |
| .CLY | Corel | File di settaggi | CorelDRAW Custom Layout | CorelDRAW Graphics Suite | Corel |
| .CMP | Microsoft Corporation | File di settaggi | Windows Connection Manager Profile | CorelDRAW Graphics Suite | Corel |
| .CMX | Corel | File con immagini vettoriali | Corel Metafile Exchange Image File | CorelDRAW Graphics Suite | Corel |
| .CMY | Corel Corporation | File di dati | CorelDRAW Custom File | CorelDRAW Graphics Suite | Corel |
| .COR | Trimble Inc. | File di GIS | Trimble Corrected SSF File | CorelDRAW Graphics Suite | Corel |
| .CPD | Adobe Systems Incorporated | File di dati | RoboHelp Cache Project Database | CorelDRAW Graphics Suite | Corel |
| .CPL | Microsoft Corporation | File di sistema | Windows Control Panel Item | CorelDRAW Graphics Suite | Corel |
| .CPT | Corel | File con immagini raster | Corel Photo-Paint Image | CorelDRAW Graphics Suite | Corel |
| .CPX | Oracle Corporation | File di settaggi | Oracle ADF Binding Context File | CorelDRAW Graphics Suite | Corel |
| .CRW | Canon Inc. | File Videocamera non elaborati | Canon Raw CIFF Image File | CorelDRAW Graphics Suite | Corel |
| .CSB | Corel | File sviluppatore | Corel PHOTO-PAINT Script | CorelDRAW Graphics Suite | Corel |
| .CSC | Corel | File sviluppatore | Corel Script File | CorelDRAW Graphics Suite | Corel |
| .CSI | ContentServ | File sviluppatore | ContentServ Include File | CorelDRAW Graphics Suite | Corel |
| .CV | Microsoft Corporation | File di dati | CodeView Data File | CorelDRAW Graphics Suite | Corel |
| .CWF | Corel Corporation | File di settaggi | CorelDRAW Workspace File | CorelDRAW Graphics Suite | Corel |
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