| C V | Unknown File Type | Uncommon Files | 1 | 1 |
| C#= | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| C++ | C++ Implementation Files | System Files | 1 | 1 |
| C0 | Golden Orchard Apple II CD Rom File | Data Files | 2 | 1 |
| C00 | WinAce Split Archive File | Compressed Files | 2 | 1 |
| C000 | Genie Backup Manager Compressed Split Backup | Backup Files | 1 | 1 |
| C01 | WinAce Split Archive Part 1 File |
Compressed Files
| 3 | 2 |
| C02 | WinAce Split Archive Second File |
Compressed Files
| 2 | 1 |
| C04 | Split Multi-volume ACE Compressed File Archive |
Compressed Files
| 2 | 1 |
| C05 | Split Multi-volume ACE Compressed File Archive |
Compressed Files
| 2 | 1 |
| C06 | Split Multi-volume ACE Compressed File Archive |
Compressed Files
| 2 | 1 |
| C07 | Split Multi-volume ACE Compressed File Archive |
Compressed Files
| 2 | 1 |
| C09 | Split Multi-volume ACE Compressed File Archive |
Compressed Files
| 2 | 1 |
| C0R | JAF Nokia BB5 Firmware Flash |
Data Files
| 1 | 1 |
| C1 | Pov-Ray For Windows 3.x Scenes Advanced Newltpot File | 3D Image Files | 1 | 1 |
| C10 | WinAce Split Archive File |
Compressed Files
| 3 | 2 |
| C11 | CARE-S InfoWorks User-Defined Pollutant Detail Data |
Data Files
| 1 | 1 |
| C11AMC | Cartographica/CartoMobile File |
Data Files
| 2 | 1 |
| C11AMZ | Cartographica/CartoMobile File |
Data Files
| 2 | 1 |
| C13 | Charlie Packer Archive |
Compressed Files
| 1 | 1 |
| C16 | C16 Creatures 3/Docking Station Image | Game Files | 1 | 1 |
| C18 | Dassault Systemes Catia V4 Sequential File | CAD Files | 1 | 1 |
| C1A | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| C1DX | C1Report C1D Open XML Document |
Data Files
| 1 | 1 |
| C1P | Capture One Preview Data |
Data Files
| 1 | 1 |
| C1S | Capture One Photo Cache File | Temporary Files | 1 | 1 |
| C1W | Capture One Work Data |
Data Files
| 1 | 1 |
| C2 | Pov-Ray For Windows 3.x Scenes Advanced Newltpot Data |
Uncommon Files
| 1 | 1 |
| C20 | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| C2C | CopyToDVD Project File |
Backup Files
| 1 | 1 |
| C2D | WinOnCD Disc Image File | Disk Image Files | 6 | 1 |
| C2I | Driver File |
System Files
| 1 | 1 |
| C2L | Cequadrat WinOnCD File |
Disk Image Files
| 1 | 1 |
| C2P | Casio ClassPad II Picture File |
Uncommon Files
| 1 | 1 |
| C3 | Pov-Ray For Windows 3.1 Scenes Advanced Newltpot |
Data Files
| 1 | 1 |
| C3B | Unknown File Type |
Uncommon Files
| 1 | 1 |
| C3D | Coordinate 3D File |
Data Files
| 3 | 1 |
| C4 | JEDMICS Image File | Raster Image Files | 2 | 1 |
| C4D | Cinema 4D Model File |
3D Image Files
| 3 | 1 |
| C4S | Clonk Game Scenario File |
Game Files
| 1 | 1 |
| C4U | OpenClonk Update System File |
Game Files
| 1 | 1 |
| C4V | Clonk Game Video File |
Game Files
| 1 | 1 |
| C6 | Organic 2D/3D Drafting & 3D Modelling Data |
CAD Files
| 1 | 1 |
| C61 | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| C9 | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| CA | Initial Telnet Cache |
Uncommon Files
| 2 | 2 |
| CA0 | Borland Installer Packed & Split File |
Uncommon Files
| 1 | 1 |
| CA1 | CrackArt Picture Image |
Raster Image Files
| 3 | 3 |
| CA2 | Delphi Install Disk12 File | Developer Files | 1 | 1 |
| CA3 | Casio WK-1800 Save All Data | Audio Files | 2 | 2 |
| CA5 | Delphi Install Disk11 File |
Developer Files
| 1 | 1 |
| CAA | CleanApp Archive File |
Backup Files
| 1 | 1 |
| CAB | Windows Cabinet File |
System Files
| 12 | 1 |
| CAC | dBASE IV Executable Data | Executable Files | 3 | 3 |
| CACHE | Cache File |
Uncommon Files
| 3 | 1 |
| CAE | Abaqus CAE Model File |
CAD Files
| 1 | 1 |
| CAF | Apple Core Audio File |
Audio Files
| 11 | 4 |
| CAFF | Core Audio File |
Audio Files
| 5 | 1 |
| CAG | ClipArt Gallery Package | Vector Image Files | 5 | 3 |
| CAH | Ulead Photo Explorer Thumbnail Cache |
Data Files
| 1 | 1 |
| CAI | SeeYou Flight Data File | GIS Files | 1 | 1 |
| CAJ | Chinese Academic Journal File | Page Layout Files | 1 | 1 |
| CAKEWALKWI | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| CAL | CALS Raster File |
Raster Image Files
| 12 | 4 |
| CALC | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| CALCULATOR | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) |
Data Files
| 3 | 1 |
| CALENDAR19 | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| CALS | CALS Raster File |
Raster Image Files
| 4 | 1 |
| CAM | Gerber CAM Job File |
CAD Files
| 3 | 2 |
| CAMERA | Unknown File Type |
Uncommon Files
| 1 | 1 |
| CAMP | WCS Color Appearance Model Profile File | Settings Files | 2 | 1 |
| CAMREC | Camtasia Studio Screen Recording | Video Files | 1 | 1 |
| CAN | Canon Navigator Fax File |
Raster Image Files
| 1 | 1 |
| CAO | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| CAP | Network Monitor Packet Capture Data File |
Data Files
| 11 | 9 |
| CAR | Car Explorer Data File |
Data Files
| 3 | 3 |
| CARAMBA | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| CARD | Funkiball Adventure Game File |
Game Files
| 2 | 2 |
| CAS | Autodesk Cascade License File |
Data Files
| 4 | 3 |
| CASE | SlipCover Case File |
Settings Files
| 1 | 1 |
| CASECONVER | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| CASTLE | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) |
Data Files
| 3 | 1 |
| CAT | Windows Catalog File |
System Files
| 9 | 8 |
| CATALOG | CATIA Catalog File |
CAD Files
| 1 | 1 |
| CATANALYSI | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| CATDRAWIN | Unknown File Type |
Uncommon Files
| 1 | 1 |
| CATDRAWING | CATIA V5 Drawing |
CAD Files
| 1 | 1 |
| CATFCT | CATIA CATfct Data File |
CAD Files
| 1 | 1 |
| CATMATERIA | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| CATMATERIAL | CATIA CATMaterial Data |
CAD Files
| 1 | 1 |
| CATPART | CATIA V5 Part File |
CAD Files
| 4 | 1 |
| CATPRODUCT | CATIA V5 Assembly File |
CAD Files
| 4 | 1 |
| CAV | Comodo Virus Definitions File |
Data Files
| 1 | 1 |
| CAZ | Computer Associates Archive File |
Compressed Files
| 1 | 1 |
| CA_ | Microsoft Cabinet File |
Compressed Files
| 1 | 1 |
| CB | Microsoft Clean Boot File |
System Files
| 1 | 1 |
| CB3 | CliBench Mk III SMP File |
Uncommon Files
| 1 | 1 |
| CB4 | Actuate Analytics File |
Data Files
| 1 | 1 |
| CB7 | Comic Book 7-Zip Archive |
Compressed Files
| 4 | 1 |
| CBA | Comic Book ACE Archive |
Compressed Files
| 4 | 3 |
of 7 
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