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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .C++ | Bjarne Stroustrup | System Files | C++ Implementation Files | C++ | Bjarne Stroustrup |
| .C2I | Unknown Developer | System Files | Driver File | Unknown Software | Unknown Developer |
| .CAB | Microsoft Corporation | System Files | Windows Cabinet File | 7-Zip | Igor Pavlov |
| .CAP | Microsoft Corporation | System Files | Network Monitor Packet Capture Data File | Microsoft Network Monitor | Microsoft Corporation |
| .CAT | Microsoft Corporation | System Files | Windows Catalog File | Microsoft Windows | Microsoft Corporation |
| .CB | Microsoft Corporation | System Files | Microsoft Clean Boot File | Microsoft Windows | Microsoft Corporation |
| .CDD | CS Odessa | System Files | ConceptDraw PRO Document | ConceptDraw PRO | CS Odessa |
| .CDJ | Padus Software | System Files | Disc Juggler File | DiscJuggler | Padus Software |
| .CDMP | Microsoft Corporation | System Files | WCS Device Model Profile | Microsoft Windows | Microsoft Corporation |
| .CGZ | Wouter van Oortmerssen | System Files | Cube Map File | Cube | Wouter van Oortmerssen |
| .CHG | Quicken | System Files | Quicken Online Data File | Intuit Quicken | Quicken |
| .CHS | Microsoft Corporation | System Files | Windows Chinese Noise-Word List File | Microsoft Windows | Microsoft Corporation |
| .CHT | Nintendo | System Files | SNES Cheat File | ZSNES | Nintendo |
| .CI | Microsoft Corporation | System Files | Windows Content Indexer Catalog File | Microsoft Windows | Microsoft Corporation |
| .CLB | Microsoft Corporation | System Files | COM+ Catalog File | Microsoft COM+ | Microsoft Corporation |
| .CLG | Microsoft Corporation | System Files | Windows Catalog File | Microsoft Windows | Microsoft Corporation |
| .CM0013 | Samsung Electronics | System Files | Samsung Smart TV Index File | Microsoft Word | Microsoft Corporation |
| .CMO | ASUS | System Files | ASUS BIOS File | Microsoft Windows | Microsoft Corporation |
| .CMP | Microsoft Corporation | System Files | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .CNT | Microsoft Corporation | System Files | Help Contents File | Microsoft HTML Help Workshop | Microsoft Corporation |
| .CPI | Sony | System Files | AVCHD Video Clip Information | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .CPL | Microsoft Corporation | System Files | Windows Control Panel Item | Microsoft Windows | Microsoft Corporation |
| .CPQ | Compaq | System Files | Compaq OEM Disc Configuration File | Microsoft Notepad | Microsoft Corporation |
| .CPR | Steinberg | System Files | Cubase Project | Steinberg Cubase | Steinberg |
| .CQ | Open Source | System Files | SYSGEN Replacement Data | CP/M | Open Source |
| .CRASH | Apple | System Files | Mac OS X Crash Log File | Apple TextEdit | Apple |
| .CUR | Unknown Developer | System Files | Windows Cursor File | ACD Systems ACDSee | ACD Systems |
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