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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .CPN | Microsoft Corporation | Data Files | Age Of Mythology Campaign File | Microsoft Age of Empires | Ensemble Studios |
| .CPO | Corel Corporation | Data Files | Corel Print House Data | Corel Print House | Corel |
| .CPQ | Compaq | Data Files | Compaq OEM Disc Configuration File | Microsoft Notepad | Microsoft Corporation |
| .CPW | Alexander V. Ilyin | Data Files | Online Cost Planning Service Cost Planning Work Data | Online Cost Planning Service | Alexander V. Ilyin |
| .CQP | IntelliQuilter | Data Files | CompuQuilter Pattern | CompuQuilter | IntelliQuilter |
| .CQQ | Kjartan Osmundsen | Data Files | Cool Quiz | Cool Quiz | Kjartan Osmundsen |
| .CQZ | CornEmpire Software | Data Files | Cool Quiz Quiz File | Cool Quiz for Windows | CornEmpire Software |
| .CR4 | Dr. Hsin H. Huang | Data Files | STABCAL Data File | STABCAL | Dr. Hsin H. Huang |
| .CR7 | Campbell Scientific | Data Files | CRBasic Source Code File | CR300-Series Dataloggers | Campbell Scientific |
| .CRACK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CRASH | Apple | Data Files | Mac OS X Crash Log File | Apple TextEdit | Apple |
| .CRD | Open Source | Data Files | Guitar Tabs | Notepad++ | Don Ho |
| .CRF | Open Source | Data Files | Cal3D Binary Materials File | Cal3DViewer | Open Source |
| .CRN | Unknown Developer | Data Files | Tree Ring Data File | Unknown Software | Unknown Developer |
| .CRO | FAO | Data Files | CropWat Data | CropWat | FAO |
| .CRS | Open Source | Data Files | StepMania Course File | StepMania | Open Source |
| .CRTX | Microsoft Corporation | Data Files | Office 2007 Chart Template File | Microsoft Excel | Microsoft Corporation |
| .CRUNCH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CRW | Canon Inc. | Data Files | Canon Raw CIFF Image File | MacPhun ColorStrokes | Macphun |
| .CS | Microsoft Corporation | Data Files | C# Source Code File | Notepad++ | Don Ho |
| .CSA | Agilent Technologies | Data Files | PNA Code Calset File | PNA Code | Agilent Technologies |
| .CSC | Corel | Data Files | Corel Script File | Corel Photo-Paint | Corel |
| .CSD | Valve | Data Files | Steam Game Data Backup File | Steam | Valve |
| .CSE | Macropool | Data Files | Web Research Document Package | Web Research Professional | Macropool |
| .CSHADER | Microsoft Corporation | Data Files | Microsoft Visual Studio Text Data | Microsoft Visual Studio | Microsoft Corporation |
| .CSK | Apple | Data Files | ClarisWorks Data | Apple AppleWorks | Apple |
| .CSL | Interscape | Data Files | CineStyle Color Lookup File | CineStyle Color Assist | Interscape |
| .CST | Smith Micro Software | Data Files | Manga Studio Story File | Manga Studio | Smith Micro Software |
| .CSV | Unknown Developer | Data Files | Comma Separated Values File | Microsoft Excel | Microsoft Corporation |
| .CS_ | Unknown Developer | Data Files | Creativ Compressed Sb16 Sbide File | Unknown Software | Unknown Developer |
| .CT0 | Tajima Group | Data Files | Tajima TBF Condition Data | DG/ML | Tajima Group |
| .CT1 | Microsoft Corporation | Data Files | Microsoft Systems Management Server Proposed Site Control Data | Microsoft Systems Management Server | Microsoft Corporation |
| .CT3 | Microsoft Corporation | Data Files | Microsoft Systems Management Server (SMS) Control File | Microsoft Systems Management Server | Microsoft Corporation |
| .CT5 | LexisNexis | Data Files | CaseMap Case Analysis Template | CaseMap | LexisNexis |
| .CT6 | LexisNexis | Data Files | CaseMap Case Analysis Template | CaseMap | LexisNexis |
| .CTB | Autodesk, Inc. | Data Files | AutoCAD Color-Based Plot Style File | Autodesk AutoCAD | Autodesk, Inc. |
| .CTD | NativeWinds LLC | Data Files | Compressed Tomahawk Document File | Tomahawk Gold | NativeWinds LLC |
| .CTE | Stefan Hagel | Data Files | Classical Text Editor Document File | Classical Text Editor | Stefan Hagel |
| .CTF | Interscape | Data Files | WhereIsIt Catalog File | WhereIsIt | Interscape |
| .CTI | Bitz & Pixelz | Data Files | Collectorz.com Template Info | Music Collector | Bitz & Pixelz |
| .CTK | Procedimientos-Uno, S.L. | Data Files | TeKton3D Project | TeKton3D | Procedimientos-Uno, S.L. |
| .CTL | Open Source | Data Files | StepMania SMZIP Package Description File | StepMania | Open Source |
| .CTM | LucasArts Entertainment Company, LLC | Data Files | Star Wars Republic Commando Map File | Star Wars Republic Commando | LucasArts Entertainment Company, LLC |
| .CTP | Cake Software Foundation | Data Files | CakePHP Template | Adobe Dreamweaver | Adobe Systems Incorporated |
| .CTRL | Oracle Corporation | Data Files | Oracle WebLogic Workshop Controls | WebLogic | Oracle Corporation |
| .CTT | Microsoft Corporation | Data Files | Messenger Contact List | Microsoft Notepad | Microsoft Corporation |
| .CTV | Swiss Academic Software | Data Files | Citavi Project | Citavi | Swiss Academic Software |
| .CTY | EA Maxis | Data Files | SimCity City File | Maxis SimCity 2000 | EA Maxis |
| .CTZ | Dextronet | Data Files | Custody Toolbox Compressed Backup File | Custody Toolbox | Dextronet |
| .CUB | Microsoft Corporation | Data Files | Analysis Services Cube File | Microsoft Excel | Microsoft Corporation |
| .CUBE | Open Source | Data Files | Gaussian Cube File | Avogadro | Open Source |
| .CUC | Naviter | Data Files | SeeYou Contest Document | SeeYou | Naviter |
| .CUL | CursorArts Company | Data Files | Windows Cursor Library | IconForge | CursorArts Company |
| .CURVE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CURXPTHEME | Stardock Corporation | Data Files | CursorXP Theme File | Stardock CursorFX | Stardock Corporation |
| .CUS | Autodesk, Inc. | Data Files | AutoCAD Custom Dictionary File | Microsoft Notepad | Microsoft Corporation |
| .CUT | Various Developers | Data Files | Dr. Halo Bitmap Image File | Lemkesoft GraphicConverter | Lemkesoft |
| .CV | Microsoft Corporation | Data Files | CodeView Data File | CodeView | Microsoft Corporation |
| .CVA | Hewlett-Packard | Data Files | HP SSM Information File | HP System Software Manager (SSM) | Hewlett-Packard |
| .CVD | invers Software | Data Files | Calamus Vector Image File | Calamus SL | invers Software |
| .CVJ | Vero Software | Data Files | Cabinet Vision Solid Job Document | Cabinet Vision Solid | Vero Software |
| .CVN | Sonic Solutions | Data Files | CineVision Encoding Session | Sonic CineVision | Sonic Solutions |
| .CVP | Symantec Corporation | Data Files | WinFax Cover Page | WinFax | Delrina |
| .CVS | Unknown Developer | Data Files | Comma Separated Values File | Microsoft Excel | Microsoft Corporation |
| .CVT | ACD Systems | Data Files | Canvas External Tool File | Canvas X | ACD Systems |
| .CW3 | Apple | Data Files | ClarisWorks Document | Apple Pages | Apple |
| .CW6 | Codeware Inc. | Data Files | COMPRESS Vessel Model File | COMPRESS | Codeware Inc. |
| .CWA | Horland Software | Data Files | Castelware Inventory Hardware/Software Audit File | CW Inventory | Horland Software |
| .CWK | Apple | Data Files | ClarisWorks Document | Apple Pages | Apple |
| .CWL | Open Source | Data Files | TeXstudio Completion Word List | TeXstudio | Open Source |
| .CWR | SAP | Data Files | Crystal Reports Report | Crystal Reports | SAP |
| .CWW | Variety Games | Data Files | Crossword Weaver Puzzle File | Crossword Weaver | Variety Games |
| .CXB | Custody X Change | Data Files | Custody X Change Data | Custody X Change | Custody X Change |
| .CXC | Custody X Change | Data Files | Custody X Change Data | Custody X Change | Custody X Change |
| .CXD | Hamamatsu Photonics K.K. | Data Files | SimplePCI Data Document | SimplePCI | Hamamatsu Photonics K.K. |
| .CXF | Data Files | Google Picasa Collage File | Google Picasa | ||
| .CXL | Pervasive Software | Data Files | Business Integrator Extract Schema | Pervasive Data Integrator | Pervasive Software |
| .CXO | Quantum CAD Ltd. | Data Files | CXInsight Export File | CXInsight | Quantum CAD Ltd. |
| .CXT | Omron Corporation | Data Files | CX-Programmer Project Text File | OMRON CX-One | Omron Corporation |
| .CYG | CyGem Ltd. | Data Files | Pollux Data File | CyGem Pollux | CyGem Ltd. |
| .CYL | Mike Carson | Data Files | Ribbons Cylinder File | Ribbons | Mike Carson |
| .CYO | Hot Neuron | Data Files | Clustify Output File | Clustify | Hot Neuron |
| .CYS | Hot Neuron | Data Files | Clustify Summary Statistics File | Clustify | Hot Neuron |
| .CYT | Crocodile Clips Ltd | Data Files | Yenka Simulation Data | Crocodile Clips Yenka | Crocodile Clips Ltd |
| .CZI | Carl Zeiss | Data Files | Carl Zeiss Image Data File | ImageJ | National Institutes of Health (NIH) |
| .CZP | Crick Software | Data Files | ClozePro Archive | ClozePro | Crick Software |
| .D02 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D03 | Interscape | Data Files | Jydivide Split File | Jydivide | Interscape |
| .D04 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D05 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D06 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D07 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D10 | TaxAct | Data Files | Drake Software Data File | Drake Software | Drake Software |
| .D11 | NorthStar Solutions | Data Files | Macro Mania Data File | Macro Mania | NorthStar Solutions |
| .D3P | UnitedPrint.com | Data Files | DigitalPrintLab Data | DigitalPrintLab | UnitedPrint.com |
| .D4C | Open Source | Data Files | Dataphor Data File | Dataphor | Open Source |
| .D71 | Commodore International | Data Files | Commodore Emulator Data | VICE | Open Source |
| .D83 | GAEB | Data Files | GAEB 1990 Data | GAEB data exchange XML | GAEB |
| .DA2 | Microsoft Corporation | Data Files | Windows Dancer File | Windows Media Center | Microsoft Corporation |
| .DAB | Epigon Media Technologies | Data Files | Digital Audio Broadcasting Audio Data | DMB Player | Epigon Media Technologies |
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