| Extension |
File Type |
File Description |
| .c | Developer | C/C++ Source Code File (Most common) |
| .c00 | Compressed | WinAce Split Archive File |
| .c01 | Compressed | WinAce Split Archive Part 1 File (Most common) |
| .c02 | Compressed | WinAce Split Archive Part 1 File |
| .c2d | Disk | WinOnCD Disc Image |
| .c4 | Raster Image | JEDMICS Image File |
| .c4d | Image | Cinema 4D Model File |
| .ca | Misc | Initial Telnet Cache |
| .cab | System | Windows Cabinet File |
| .cache | Misc | Cache File |
| .caf | Audio | Core Audio File |
| .cag | Image | Clip Art Gallery |
| .cal | Page Layout | Calendar File (Most common) |
| .calb | Misc | Coolect Album File |
| .cals | Raster Image | CALS Raster Graphic File |
| .cam | Misc | Gerber CAM Job File (Most common) |
| .camrec | Video | Camtasia Studio Screen Recording |
| .can | Raster Image | Canon Navigator Fax Document |
| .cap | Developer | Construct Game Development File (Most common) |
| .car | Compressed | CAR Archive |
| .cat | Data | Advanced Disk Catalog Database |
| .catpart | Image | CATIA V5 Part Document |
| .cbg | Data | CyberGauge Data File |
| .cbk | Backup | Backup Configuration File |
| .cbl | Developer | COBOL Program |
| .cbr | Compressed | Comic Book RAR Archive |
| .cbt | Misc | Computer Based Training File |
| .cbz | Compressed | Comic Book ZIP Archive |
| .cc | Developer | C++ Source Code File |
| .ccd | Disk | CloneCD Disk Image |
| .ccf | Encoded | CryptLoad Container File |
| .cch | Data | Corel Chart File |
| .ccn | Developer | Compressed Multimedia Fusion File |
| .ccr | Data | ASTM Continuity of Care Record |
| .cct | Data | Director Protected Cast Resource |
| .ccx | Plugin | Click & Create Extension |
| .cd | Disk | CD-i OptImage (Most common) |
| .cd2 | Page Layout | Click'N Design 3d File |
| .cd5 | Raster Image | Chasys Draw Image File |
| .cda | Audio | CD Audio Track Shortcut |
| .cdf | Data | Content Definition File (Most common) |
| .cdi | Disk | DiscJuggler Disc Image |
| .cdr | Vector Image | CorelDRAW Image File (Most common) |
| .cdt | Image | CorelDraw Template |
| .cdx | Data | Compound Index File |
| .ce | Image | Computer Eyes Image |
| .ceb | Misc | Apabi eBook File |
| .cel | Audio | Audition Loop (Most common) |
| .celtx | Data | Celtx Project File |
| .cer | Web | Internet Security Certificate |
| .cfg | Settings | Configuration File (Most common) |
| .cfl | Misc | IMVU Product File |
| .cfm | Web | ColdFusion Markup File |
| .cgf | Game | Far Cry Model File |
| .cgi | Executable | Common Gateway Interface Script |
| .cgm | Vector Image | Computer Graphics Metafile |
| .cgr | Game | Audiosurf Data File |
| .cgz | System | Linux Drivers Archive (Most common) |
| .cha | Web | Online Chat Configuration File (Most common) |
| .charset | Text | Character Set |
| .chat | Web | Online Chat Configuration File |
| .chg | Data | Quicken Online Data File |
| .chk | Misc | Saved File Fragment (Most common) |
| .chl | Settings | WinFast PVR2 Channel List |
| .chm | Web | Compiled HTML Help File |
| .chn | Data | Ethnograph Data |
| .chord | Text | Song Chords File |
| .chr | Font | Borland Character Set |
| .cht | Game | SNES Cheat File |
| .chw | Misc | Compiled Help Index File |
| .cidb | Audio | iTunes CD Information File |
| .cif | Disk | Easy CD Creator Disk Image |
| .cil | Image | ClipArt Gallery Packaged File |
| .cin | Raster Image | Kodak Cineon Bitmap File |
| .cit | Raster Image | Intergraph Bitmap Image File |
| .ckd | Data | Kubotek Design Container |
| .ckt | Data | CircuitMaker File |
| .cl5 | Disk | Easy CD Creator 5 Saved Project |
| .class | Developer | Java Class File |
| .cld | Page Layout | Canon CD Label Template |
| .clix | Data | CLIX Command File |
| .clkk | Misc | Clicker Keyboard |
| .clkt | Misc | Clicker Template |
| .clkw | Misc | Clicker Word Bank |
| .clkx | Misc | Clicker Grid Set |
| .clp | Data | Windows Clipboard File |
| .clr | Misc | Flash Color Set (Most common) |
| .cls | Developer | Program Class File |
| .clx | Encoded | Ceelox SecureMail Secure Message |
| .cm | Settings | Cable Modem Configuration File |
| .cm2 | Image | Poser Camera Set File |
| .cmd | Executable | Windows Command File |
| .cmf | Audio | Creative Music Format |
| .cmm | Misc | Corel Multimedia Manager Album |
| .cmp | Image | Solid Edge Wire Harness File (Most common) |
| .cms | Web | Content Management System |
| .cmx | Vector Image | Corel Metafile Exchange Image File |
| .cmz | Image | Compressed Poser Camera Set File |
| .cna | Data | Catena Project File |
| .cnc | Misc | CNC Machine Tool Path |
| .cnf | Settings | Telnet Configuration File |
| .cnt | System | Help Contents File |
| .cnv | Vector Image | Canvas 6-8 Drawing File |
| .cob | Developer | COBOL Source Code File |
| .cod | Developer | Compiled Source Code |
| .col | Game | Grand Theft Auto Collision File |
| .colorpicker | Plugin | Color Picker Plugin |
| .com | Executable | DOS Command File |
| .comicdoc | Page Layout | Comic Life Document |
| .component | Plugin | Mac OS X System Component |
| .conf | Settings | Unix Configuration File |
| .config | Developer | Configuration File |
| .copy | Audio | Sony Ericsson Protected Content File |
| .cox | Plugin | Click & Create Extension |
| .cp | Developer | Xcode C++ Source File (Most common) |
| .cp | Developer | Xcode C++ Source File (Most common) |
| .cp3 | Misc | Grand Prix 3 Cockpit Shape File |
| .cp9 | Compressed | ChoicePoint Encrypted File |
| .cpc | Raster Image | CPC Compressed Image File |
| .cpd | Raster Image | Compressed PhotoDefiner Image File |
| .cpgz | Compressed | Compressed CPIO Archive |
| .cph | Page Layout | Corel Print House File |
| .cpi | System | Codepage Information File |
| .cpio | Encoded | Unix CIPO Archive |
| .cpl | System | Windows Control Panel |
| .cpp | Developer | C++ Source Code File |
| .cpr | Audio | Cubase Project |
| .cps | Raster Image | Corel Photo House File |
| .cpt | Image | Corel Photo-Paint Document (Most common) |
| .cr2 | Raster Image | Canon Raw Image File (Most common) |
| .crd | Text | Guitar Tabs (Most common) |
| .crt | Web | Security Certificate |
| .crw | Raster Image | Canon Raw CIFF Image File |
| .crwl | Text | Windows Crawl File |
| .crx | Plugin | Chrome Extension |
| .crz | Image | Compressed Poser Character Rigging File |
| .cs | Developer | C Sharp Source Code File |
| .csa | Data | PNA Code Calset File |
| .csd | Page Layout | Compact Shared Document |
| .csf | Raster Image | Content Secure Format (Most common) |
| .csh | Executable | C Shell Script (Most common) |
| .csi | Developer | ContentServ Include File (Most common) |
| .csm | Image | Character Studio Marker File |
| .cso | Disk | Compressed ISO Disk Image |
| .csp | Web | Concept Server Page |
| .css | Web | Cascading Style Sheet |
| .cst | Developer | ContentServ Template |
| .csv | Data | Comma Separated Values File |
| .ctf | Data | WhereIsIt Catalog (Most common) |
| .ctf | Data | WhereIsIt Catalog (Most common) |
| .ctg | Misc | Canon Digital Camera Catalog File |
| .ctl | Developer | Visual Basic UserControl Object File |
| .ctt | Data | Messenger Contact List |
| .ctx | Developer | Visual Basic Control Binary File |
| .cty | Game | SimCity City File |
| .cue | Disk | Cue Sheet File (Most common) |
| .cui | Settings | AutoCAD Custom Workspace File |
| .cur | System | Windows Cursor |
| .cut | Image | Dr. Halo Bitmap Image File |
| .cv5 | Vector Image | Canvas 5 Drawing File |
| .cvc | Video | cVideo |
| .cvg | Vector Image | Calamus Vector Graphic File |
| .cvi | Vector Image | Canvas Image Format (Most common) |
| .cvn | Data | CineVision Encoding Session |
| .cvs | Vector Image | Canvas 4 Drawing File |
| .cvx | Vector Image | Canvas 9 Image File |
| .cwf | Settings | CorelDraw Workspace File |
| .cwk | Data | ClarisWorks Document |
| .cwp | Audio | Cakewalk SONAR Project |
| .cws | Data | Claris Works Template |
| .cwz | Data | Circuit Wizard File |
| .cxt | Data | Director Protected Cast File |
| .cyi | Text | Clustify Input File |
| .cyo | Data | Clustify Output File |
| .cys | Data | Clustify Summary File |
| .cyw | Executable | Rbot.CYW Worm File |
