| .CAG | Microsoft Corporation | Fichiers d’image vectorielle | ClipArt Gallery Package | Microsoft PowerPoint | Microsoft Corporation |
| .CCX | Clickteam | Fichiers d’image vectorielle | Click & Create Extension | Multimedia Fusion | Interscape |
| .CDD | CS Odessa | Fichiers d’image vectorielle | ConceptDraw PRO Document | ConceptDraw PRO | CS Odessa |
| .CDMM | CS Odessa | Fichiers d’image vectorielle | ConceptDraw MINDMAP Document | CS Odessa ConceptDraw MINDMAP | CS Odessa |
| .CDR | Corel | Fichiers d’image vectorielle | CorelDRAW Vector Image File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .CDS | CS Odessa | Fichiers d’image vectorielle | ConceptDraw SlideShow | ConceptDraw PRO | CS Odessa |
| .CDT | Sony | Fichiers d’image vectorielle | CD-Text File | IsoBuster | Smart Projects |
| .CDX | Microsoft Corporation | Fichiers d’image vectorielle | Compound Index File | Microsoft Visual FoxPro | Microsoft Corporation |
| .CGM | Unknown Developer | Fichiers d’image vectorielle | Computer Graphics Metafile | Adobe Illustrator CC | Adobe Systems Incorporated |
| .CIL | Symantec Corporation | Fichiers d’image vectorielle | Norton CleanSweep Installation Log File | Microsoft Notepad | Microsoft Corporation |
| .CMX | Corel | Fichiers d’image vectorielle | Corel Metafile Exchange Image File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .CNV | ACD Systems | Fichiers d’image vectorielle | Canvas Drawing File | ACD Systems ACDSee | ACD Systems |
| .COR | Trimble Inc. | Fichiers d’image vectorielle | Trimble Corrected SSF File | GPS Pathfinder Office Software | Trimble Inc. |
| .COREL WORDPERFECT DICTIONARY | Corel | Fichiers d’image vectorielle | Corel WordPerfect Dictionary File | Corel WordPerfect X8 | Corel |
| .CPI | Sony | Fichiers d’image vectorielle | AVCHD Video Clip Information | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .CRG | invers Software | Fichiers d’image vectorielle | Calamus Vector Image File | Calamus SL | invers Software |
| .CSY | ACD Systems | Fichiers d’image vectorielle | Canvas Symbol File | Canvas X | ACD Systems |
| .CTN | Cadterns Custom Clothing | Fichiers d’image vectorielle | Cadterns Sloper Data | Cadterns | Cadterns Custom Clothing |
| .CV5 | ACD Systems | Fichiers d’image vectorielle | Canvas 5 Drawing File | Canvas X | ACD Systems |
| .CVD | invers Software | Fichiers d’image vectorielle | Calamus Vector Image File | Calamus SL | invers Software |
| .CVG | invers Software | Fichiers d’image vectorielle | Calamus Vector Image File | Calamus SL | invers Software |
| .CVL | GitHub, Inc. | Fichiers d’image vectorielle | Coastal Vector Listing File Format | GPSylon | GitHub, Inc. |
| .CVS | Unknown Developer | Fichiers d’image vectorielle | Comma Separated Values File | Microsoft Excel | Microsoft Corporation |
| .CVX | ACD Systems | Fichiers d’image vectorielle | Canvas Drawing File | ACD Systems ACDSee | ACD Systems |
| .CXF | Google | Fichiers d’image vectorielle | Google Picasa Collage File | Google Picasa | Google |
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