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