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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .C01 | e-merge GmbH | Audio Files | WinAce Split Archive Part 1 File | WinAce | e-merge GmbH |
| .CA3 | Casio Computer Co., Ltd. | Audio Files | Casio WK-1800 Save All Data | WK-1800 | Casio Computer Co., Ltd. |
| .CAF | Apple | Audio Files | Apple Core Audio File | Apple QuickTime Player | Apple |
| .CAFF | Apple | Audio Files | Core Audio File | Apple QuickTime Player | Apple |
| .CAP | Microsoft Corporation | Audio Files | Network Monitor Packet Capture Data File | Microsoft Network Monitor | Microsoft Corporation |
| .CC_ | Unknown Developer | Audio Files | Audio Utility Midimach Compressed File | Unknown Software | Unknown Developer |
| .CD | Microsoft Corporation | Audio Files | Visual Studio Class Diagram | Microsoft Visual Studio | Microsoft Corporation |
| .CDA | Microsoft Corporation | Audio Files | CD Audio Track Shortcut | Microsoft Windows Media Player | Microsoft Corporation |
| .CDDA | Microsoft Corporation | Audio Files | CD Digital Audio File | Apple iTunes | Apple |
| .CDG | Open Source | Audio Files | Compact Disc Plus Graphics Image | Nullsoft Winamp | Nullsoft |
| .CDO | NCH Software | Audio Files | Crescendo Music Notation File | NCH Crescendo Music Notation Editor | NCH Software |
| .CDR | Corel | Audio Files | CorelDRAW Vector Image File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .CEL | Affymetrix | Audio Files | Affymetrix Probe Results File | The MathWorks MATLAB | MathWorks |
| .CF1 | Würth Online World GmbH | Audio Files | WOW! Data | WOW! | Würth Online World GmbH |
| .CFA | Frontline | Audio Files | ComProbe Analyzer Capture File | Frontline ComProbe Analysis System | Frontline |
| .CKB | Cricket Technology | Audio Files | Cricket Audio Bank File | Cricket audio | Cricket Technology |
| .CKF | Casio Computer Co., Ltd. | Audio Files | Casio Keyboard File | Casio Data Manager | Casio Computer Co., Ltd. |
| .CL3 | Roxio | Audio Files | Easy CD Creator CD Layout | Roxio Creator NXT Pro 5 | Roxio |
| .CMF | Creative Technology Ltd. | Audio Files | Creative Music Format | Nullsoft Winamp | Nullsoft |
| .CMP | Microsoft Corporation | Audio Files | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .COPY | Sony Mobile Communications | Audio Files | Sony Ericsson Protected Content File | Sony Ericsson Mobile Phones | Sony Mobile Communications |
| .CPR | Steinberg | Audio Files | Cubase Project | Steinberg Cubase | Steinberg |
| .CPT | Corel | Audio Files | Corel Photo-Paint Image | Corel Presentations X8 | Corel |
| .CS3 | Casio Computer Co., Ltd. | Audio Files | Casio WK-1800 Keyboard Output File | WK-1800 | Casio Computer Co., Ltd. |
| .CSH | Adobe Systems Incorporated | Audio Files | Photoshop Custom Shapes File | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .CTS | Reallusion, Inc. | Audio Files | CrazyTalk Script File | CrazyTalk | Reallusion, Inc. |
| .CWP | Cakewalk, Inc. | Audio Files | Cakewalk SONAR Project | Cakewalk SONAR | Cakewalk, Inc. |
| .CWS | ChordWizard Software Pty Ltd | Audio Files | ChordWizard Songtrix Song | ChordWizard Songtrix | ChordWizard Software Pty Ltd |
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