| .C00 | e-merge GmbH | Gecomprimeerde bestanden | WinAce Split Archive File | WinAce | e-merge GmbH |
| .C01 | e-merge GmbH | Gecomprimeerde bestanden | WinAce Split Archive Part 1 File | WinAce | e-merge GmbH |
| .C02 | e-merge GmbH | Gecomprimeerde bestanden | WinAce Split Archive Second File | WinAce | e-merge GmbH |
| .C04 | e-merge GmbH | Gecomprimeerde bestanden | Split Multi-volume ACE Compressed File Archive | WinAce | e-merge GmbH |
| .C05 | e-merge GmbH | Gecomprimeerde bestanden | Split Multi-volume ACE Compressed File Archive | WinAce | e-merge GmbH |
| .C06 | e-merge GmbH | Gecomprimeerde bestanden | Split Multi-volume ACE Compressed File Archive | WinAce | e-merge GmbH |
| .C07 | e-merge GmbH | Gecomprimeerde bestanden | Split Multi-volume ACE Compressed File Archive | WinAce | e-merge GmbH |
| .C09 | e-merge GmbH | Gecomprimeerde bestanden | Split Multi-volume ACE Compressed File Archive | WinAce | e-merge GmbH |
| .C10 | e-merge GmbH | Gecomprimeerde bestanden | WinAce Split Archive File | WinAce | e-merge GmbH |
| .C13 | Unknown Developer | Gecomprimeerde bestanden | Charlie Packer Archive | Charlie Packer | Unknown Developer |
| .CA1 | Piotr Fusik | Gecomprimeerde bestanden | CrackArt Picture Image | Recoil | Piotr Fusik |
| .CAT | Microsoft Corporation | Gecomprimeerde bestanden | Windows Catalog File | Microsoft Windows | Microsoft Corporation |
| .CAZ | Cadwork SA | Gecomprimeerde bestanden | Computer Associates Archive File | Cadwork | Cadwork SA |
| .CA_ | Microsoft Corporation | Gecomprimeerde bestanden | Microsoft Cabinet File | Microsoft Windows | Microsoft Corporation |
| .CB7 | Smith Micro Software | Gecomprimeerde bestanden | Comic Book 7-Zip Archive | 7-Zip | Igor Pavlov |
| .CBA | WinAbility Software | Gecomprimeerde bestanden | Comic Book ACE Archive | GonVisor | G.A.A. |
| .CBR | Unknown Developer | Gecomprimeerde bestanden | Comic Book RAR Archive | WinRAR | Eugene Roshal |
| .CBT | Various Developers | Gecomprimeerde bestanden | Comic Book TAR File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CCH | Microsoft Corporation | Gecomprimeerde bestanden | .NET Security Resolution Cache File | Microsoft .NET Framework | Microsoft Corporation |
| .CDZ | ePSXe Software S.L | Gecomprimeerde bestanden | Compressed CD Image File | pSX emulator | ePSXe Software S.L |
| .CHZ | Unknown Developer | Gecomprimeerde bestanden | ChArc Compressed File Archive | Unknown Software | Unknown Developer |
| .CJB | Autodesk, Inc. | Gecomprimeerde bestanden | Autodesk Cleaner XL Job | Autodesk Cleaner XL | Autodesk, Inc. |
| .CMP | Microsoft Corporation | Gecomprimeerde bestanden | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .CNR | David Harris | Gecomprimeerde bestanden | Pegasus Mail Mail Message Stored In Systemwide Folder | Pegasus Mail | David Harris |
| .CN_ | Microsoft Corporation | Gecomprimeerde bestanden | Compressed Windows Help Content | Microsoft Windows | Microsoft Corporation |
| .CPACK | Unknown Developer | Gecomprimeerde bestanden | Cpack Archive File | Cpack | SourceForge |
| .CPGZ | Open Source | Gecomprimeerde bestanden | Compressed UNIX CPIO Archive | Apple Archive Utility | Apple |
| .CPI | Sony | Gecomprimeerde bestanden | AVCHD Video Clip Information | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .CPT | Corel | Gecomprimeerde bestanden | Corel Photo-Paint Image | Corel Presentations X8 | Corel |
| .CPZ | Terry A. Davis | Gecomprimeerde bestanden | LoseThos C+ Source File | LoseThos | Terry A. Davis |
| .CSK | Apple | Gecomprimeerde bestanden | ClarisWorks Data | Apple AppleWorks | Apple |
| .CTW | Open Source | Gecomprimeerde bestanden | CTW Compressed File | CTW | Open Source |
| .CV | Microsoft Corporation | Gecomprimeerde bestanden | CodeView Data File | CodeView | Microsoft Corporation |
| .CZIP | Matteo Riso | Gecomprimeerde bestanden | ZipGenius CryptoZip File | WinInizio ZipGenius | Matteo Riso |
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