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