| Extension | Description | File Type |
|---|
| c | C/C++ Source Code File | Developer Files |
| c00 | Corel Ventura Print File | Layout Files |
| c00 | Winace Split Archive File | Archived Files |
| cab | Windows Cabinet File | Archived Files |
| cache | Cache File | Misc Files |
| caj | China Academic Journals Fulltext Database File | Text Files |
| cam | Casio Image File | Graphic Files |
| camrec | Camtasia Studio Recorded File | Video Files |
| cap | Caption File | Desktop Publishing |
| cat | Advanced Disk Catalog File | Data Files |
| catalog | Catia Catalog File | 3D Files |
| cbf | Calender Builder File | Misc Files |
| cbr | Comic Book Archive File | Archived Files |
| cbz | Comic Book ZIP File | Archived Files |
| ccd | CloneCD Control File | Disk Image Files |
| ccf | CryptLoad Download Link File | Web Files |
| cd | Philips/Optlmage Master Tool File | Disk Image Files |
| cda | Compact Disc Audio File Shortcut | Audio Files |
| cdb | Symbian OS Contacts Database File | Data Files |
| cdd | ConceptDraw Document File | Data Files |
| cdf | Component Definition File | Developer Files |
| cdg | Compact Disc Plus Graphics File | Graphic Files |
| cdi | DiscJuggler Image File | Disk Image Files |
| cdm | Media Maker Disk Image File | Disk Image Files |
| cdp | Visual Objects Developer File | Developer Files |
| cdr | CorelDRAW Image File | Graphic Files |
| cdt | CorelDraw Template File | Settings Files |
| cdw | CadKey Organized Dialogue File | Data Files |
| cdx | CorelDraw Compressed Image File | Graphic Files |
| ceb | Apabi eBook File | Misc Files |
| cf | Sendmail Configuration File | Settings Files |
| cfg | Configuration File | Settings Files |
| cfm | Cold Fusion Template File | Web Files |
| cfp | Quicken Cash Flow Projection File | Data Files |
| cfr | Crossfire Replay file | Game Files |
| cgd | Cricket Graph Data File | Data Files |
| cgi | Common Gateway Interface script | Executable Files |
| chk | Recovered File Fragments | Misc Files |
| chm | Windows Help File | Text Files |
| chp | Corel Ventura Chapter File | Text Files |
| cht | Harvard Graphics Vector File | Graphic Files |
| chw | Compiled Help Index File | Misc Files |
| cl | i5 QCLSRS Source File | Text Files |
| cl | Articons Pro Cursor Library File | Graphic Files |
| class | Java Class File | Developer Files |
| clb | ICQ Contact List File | Misc Files |
| clg | Windows Catalog File | System Files |
| cli | Client Management System Customer File | Data Files |
| clm | COLIMO file | 3D Files |
| clpi | Blue-ray Disc Clip Information File | Video Files |
| cmap | Cmap Tools Concept Map File | Misc Files |
| cmd | Command Prompt File | Executable Files |
| cmg | CMG File | Game Files |
| cmp | Sharepoint Content Migration Package | Web Files |
| cmx | Corel Metafile Exchange File | Graphic Files |
| cnf | Configuration File | Settings Files |
| cnt | Help Table Of Contents File | System Files |
| cod | Compiler Program Code | Developer Files |
| cof | COFFEE Script File | 3D Files |
| col | Autodesk Colour Palette File | 3D Files |
| com | DOS Command File | System Files |
| con | Concept Application Source File | Web Files |
| conf | Configuration File | Settings Files |
| config | Configuration File | Developer Files |
| cont | Panasonic Camcorder File | Multimedia Files |
| cos | Creatures Source Code File | Game Files |
| cpf | Clever Cache Profile File | Misc Files |
| cpi | AVCHD Clip Information | Video Files |
| cpp | C++ Language Source Code File | Developer Files |
| cpr | Cubase Project File | Audio Files |
| cpt | Corel Photo-Paint Image File | Graphic Files |
| cr | Iris CT Bitmap Files | Graphic Files |
| cr2 | Canon Raw Image File | Graphic Files |
| crash | Mac OS X Crash Log File | System Files |
| crc | Total Commander CRC File | Misc Files |
| crdownload | Google Chrome Temporary File | Misc Files |
| crtx | Microsoft Chart Template File | Spreadsheet Files |
| crw | Canon RAW Image File | Graphic Files |
| crx | Chrome Extension File | Plugin Files |
| cs | Visual C# Source File | Developer Files |
| csd | Compact Shared Document File | Document Files |
| csf | Adobe Colour Settings File | Graphic Files |
| cso | Compressed ISO Image File | Disk Image Files |
| css | Cascading Sheet Style File | Layout Files |
| csv | Comma Seperated Values | Data Files |
| ct | Continous Tone File | Graphic Files |
| ctg | Canon Catalog File | Audio Files |
| ctl | Microsoft Visual Basic Control File | Developer Files |
| ctt | Messenger contacts file | Data Files |
| cue | Cue Sheet File | Disk Image Files |
| cur | Windows Cursor File | System Files |
| cursorfx | CursorFX Graphic File | Graphic Files |
| curxptheme | CursorXP Theme File | Graphic Files |
| cva | ACD Canvas Sequence Set File | Graphic Files |
| cxf | Google Picasa Collage File | Misc Files |
| cxt | Protected Cast Member File | Document Files |