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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .CAG | Microsoft Corporation | Text Files | ClipArt Gallery Package | Microsoft PowerPoint | Microsoft Corporation |
| .CDS | CS Odessa | Text Files | ConceptDraw SlideShow | ConceptDraw PRO | CS Odessa |
| .CHARSET | Sublime HQ Pty Ltd | Text Files | Character Set | Apple TextEdit | Apple |
| .CHART | Interscape | Text Files | Feedback Chart File | Microsoft Notepad | Microsoft Corporation |
| .CHORD | Open Source | Text Files | Song Chords File | Notepad++ | Don Ho |
| .CLB | Microsoft Corporation | Text Files | COM+ Catalog File | Microsoft COM+ | Microsoft Corporation |
| .COD | Unknown Developer | Text Files | Compiled Source Code | Microsoft Visual Studio | Microsoft Corporation |
| .COMMON | Apple | Text Files | Unix Script | Unix | AT&T Labs |
| .COO | Autodesk, Inc. | Text Files | AutoCAD Bounding Coordinates Cookie | Microsoft Notepad | Microsoft Corporation |
| .CPR | Steinberg | Text Files | Cubase Project | Steinberg Cubase | Steinberg |
| .CST | Smith Micro Software | Text Files | Manga Studio Story File | Manga Studio | Smith Micro Software |
| .CTX | Microsoft Corporation | Text Files | Visual Basic Control Binary File | Microsoft Visual Studio | Microsoft Corporation |
| .CWS | ChordWizard Software Pty Ltd | Text Files | ChordWizard Songtrix Song | ChordWizard Songtrix | ChordWizard Software Pty Ltd |
| .CYI | Hot Neuron | Text Files | Clustify Input File | Clustify | Hot Neuron |
| .CZS | Bruno DENIS | Text Files | WinEcran Screen Link File | WinEcran | Bruno DENIS |
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