| .CT5 | LexisNexis | Gegevensbestanden | CaseMap Case Analysis Template | CaseMap | LexisNexis |
| .CT6 | LexisNexis | Gegevensbestanden | CaseMap Case Analysis Template | CaseMap | LexisNexis |
| .CTB | Autodesk, Inc. | Gegevensbestanden | AutoCAD Color-Based Plot Style File | Autodesk AutoCAD | Autodesk, Inc. |
| .CTD | NativeWinds LLC | Gegevensbestanden | Compressed Tomahawk Document File | Tomahawk Gold | NativeWinds LLC |
| .CTE | Stefan Hagel | Gegevensbestanden | Classical Text Editor Document File | Classical Text Editor | Stefan Hagel |
| .CTF | Interscape | Gegevensbestanden | WhereIsIt Catalog File | WhereIsIt | Interscape |
| .CTI | Bitz & Pixelz | Gegevensbestanden | Collectorz.com Template Info | Music Collector | Bitz & Pixelz |
| .CTK | Procedimientos-Uno, S.L. | Gegevensbestanden | TeKton3D Project | TeKton3D | Procedimientos-Uno, S.L. |
| .CTL | Open Source | Gegevensbestanden | StepMania SMZIP Package Description File | StepMania | Open Source |
| .CTM | LucasArts Entertainment Company, LLC | Gegevensbestanden | Star Wars Republic Commando Map File | Star Wars Republic Commando | LucasArts Entertainment Company, LLC |
| .CTP | Cake Software Foundation | Gegevensbestanden | CakePHP Template | Adobe Dreamweaver | Adobe Systems Incorporated |
| .CTRL | Oracle Corporation | Gegevensbestanden | Oracle WebLogic Workshop Controls | WebLogic | Oracle Corporation |
| .CTT | Microsoft Corporation | Gegevensbestanden | Messenger Contact List | Microsoft Notepad | Microsoft Corporation |
| .CTV | Swiss Academic Software | Gegevensbestanden | Citavi Project | Citavi | Swiss Academic Software |
| .CTY | EA Maxis | Gegevensbestanden | SimCity City File | Maxis SimCity 2000 | EA Maxis |
| .CTZ | Dextronet | Gegevensbestanden | Custody Toolbox Compressed Backup File | Custody Toolbox | Dextronet |
| .CUB | Microsoft Corporation | Gegevensbestanden | Analysis Services Cube File | Microsoft Excel | Microsoft Corporation |
| .CUBE | Open Source | Gegevensbestanden | Gaussian Cube File | Avogadro | Open Source |
| .CUC | Naviter | Gegevensbestanden | SeeYou Contest Document | SeeYou | Naviter |
| .CUL | CursorArts Company | Gegevensbestanden | Windows Cursor Library | IconForge | CursorArts Company |
| .CURVE | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CURXPTHEME | Stardock Corporation | Gegevensbestanden | CursorXP Theme File | Stardock CursorFX | Stardock Corporation |
| .CUS | Autodesk, Inc. | Gegevensbestanden | AutoCAD Custom Dictionary File | Microsoft Notepad | Microsoft Corporation |
| .CUT | Various Developers | Gegevensbestanden | Dr. Halo Bitmap Image File | Lemkesoft GraphicConverter | Lemkesoft |
| .CV | Microsoft Corporation | Gegevensbestanden | CodeView Data File | CodeView | Microsoft Corporation |
| .CVA | Hewlett-Packard | Gegevensbestanden | HP SSM Information File | HP System Software Manager (SSM) | Hewlett-Packard |
| .CVD | invers Software | Gegevensbestanden | Calamus Vector Image File | Calamus SL | invers Software |
| .CVJ | Vero Software | Gegevensbestanden | Cabinet Vision Solid Job Document | Cabinet Vision Solid | Vero Software |
| .CVN | Sonic Solutions | Gegevensbestanden | CineVision Encoding Session | Sonic CineVision | Sonic Solutions |
| .CVP | Symantec Corporation | Gegevensbestanden | WinFax Cover Page | WinFax | Delrina |
| .CVS | Unknown Developer | Gegevensbestanden | Comma Separated Values File | Microsoft Excel | Microsoft Corporation |
| .CVT | ACD Systems | Gegevensbestanden | Canvas External Tool File | Canvas X | ACD Systems |
| .CW3 | Apple | Gegevensbestanden | ClarisWorks Document | Apple Pages | Apple |
| .CW6 | Codeware Inc. | Gegevensbestanden | COMPRESS Vessel Model File | COMPRESS | Codeware Inc. |
| .CWA | Horland Software | Gegevensbestanden | Castelware Inventory Hardware/Software Audit File | CW Inventory | Horland Software |
| .CWK | Apple | Gegevensbestanden | ClarisWorks Document | Apple Pages | Apple |
| .CWL | Open Source | Gegevensbestanden | TeXstudio Completion Word List | TeXstudio | Open Source |
| .CWR | SAP | Gegevensbestanden | Crystal Reports Report | Crystal Reports | SAP |
| .CWW | Variety Games | Gegevensbestanden | Crossword Weaver Puzzle File | Crossword Weaver | Variety Games |
| .CXB | Custody X Change | Gegevensbestanden | Custody X Change Data | Custody X Change | Custody X Change |
| .CXC | Custody X Change | Gegevensbestanden | Custody X Change Data | Custody X Change | Custody X Change |
| .CXD | Hamamatsu Photonics K.K. | Gegevensbestanden | SimplePCI Data Document | SimplePCI | Hamamatsu Photonics K.K. |
| .CXF | Google | Gegevensbestanden | Google Picasa Collage File | Google Picasa | Google |
| .CXL | Pervasive Software | Gegevensbestanden | Business Integrator Extract Schema | Pervasive Data Integrator | Pervasive Software |
| .CXO | Quantum CAD Ltd. | Gegevensbestanden | CXInsight Export File | CXInsight | Quantum CAD Ltd. |
| .CXT | Omron Corporation | Gegevensbestanden | CX-Programmer Project Text File | OMRON CX-One | Omron Corporation |
| .CYG | CyGem Ltd. | Gegevensbestanden | Pollux Data File | CyGem Pollux | CyGem Ltd. |
| .CYL | Mike Carson | Gegevensbestanden | Ribbons Cylinder File | Ribbons | Mike Carson |
| .CYO | Hot Neuron | Gegevensbestanden | Clustify Output File | Clustify | Hot Neuron |
| .CYS | Hot Neuron | Gegevensbestanden | Clustify Summary Statistics File | Clustify | Hot Neuron |
| .CYT | Crocodile Clips Ltd | Gegevensbestanden | Yenka Simulation Data | Crocodile Clips Yenka | Crocodile Clips Ltd |
| .CZI | Carl Zeiss | Gegevensbestanden | Carl Zeiss Image Data File | ImageJ | National Institutes of Health (NIH) |
| .CZP | Crick Software | Gegevensbestanden | ClozePro Archive | ClozePro | Crick Software |
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