| C File Extensions |
File types with extensions that start with the letter C.
| Extension | File Type | File Summary |
| .c | Manufacturer | C/C++ Source Code File |
| .c | Manufacturer | Lite-C Script |
| .c00 | Compressed | WinAce Split Archive File |
| .c01 | Audio | Typhoon Wave Audio File |
| .c01 | Compressed | WinAce Split Archive Part 1 File |
| .c02 | Compressed | WinAce Split Archive Part 1 File |
| .c2d | Disk Image | WinOnCD Disc Image |
| .c2r | Settings | Windows Media Center Click-To-Record File |
| .c4 | Raster Image | JEDMICS Image File |
| .c4d | 3D Image | Cinema 4D Model File |
| .c4k | Game | Clonk Key File |
| .ca | Misc | Initial Telnet Cache |
| .cab | System | Windows Cabinet File |
| .cache | Misc | Cache File |
| .cad | CAD | BobCAD-CAM File |
| .caf | Audio | Core Audio File |
| .caf | Data | Class Action Gradebook File |
| .cag | Vector Image | ClipArt Gallery Package |
| .cal | Page Layout | Calendar File |
| .cal | Raster Image | CALS Raster Graphic |
| .calb | Misc | Coolect Album File |
| .cals | Raster Image | CALS Raster Graphic File |
| .cam | Raster Image | CASIO Digital Camera Picture File |
| .cam | CAD | Gerber CAM Job File |
| .camp | Settings | WCS Color Appearance Model Profile File |
| .camproj | Video | Camtasia Studio Project |
| .camrec | Video | Camtasia Studio Screen Recording |
| .can | Raster Image | Canon Navigator Fax Document |
| .cap | Manufacturer | Construct Game Development File |
| .cap | Data | Packet Capture File |
| .car | Compressed | CAR Archive |
| .car | Manufacturer | Brew Component Application Resource File |
| .carc | Game | Nintendo DS Compressed Archive File |
| .cat | Database | Advanced Disk Catalog Database |
| .catpart | CAD | CATIA V5 Part File |
| .catproduct | CAD | CATIA V5 Assembly File |
| .cav | Data | Comodo Virus Definitions File |
| .cb7 | Compressed | Comic Book 7-Zip Archive |
| .cbds | Misc | Comic Book DS File |
| .cbf | Page Layout | Calendar Builder File |
| .cbf | Game | ChessBase Game Information File |
| .cbg | Data | CyberGauge Data File |
| .cbk | Backup | Backup Configuration File |
| .cbl | Manufacturer | COBOL Program File |
| .cbr | Compressed | Comic Book RAR Archive |
| .cbs | Game | Code Breaker PS2 Save File |
| .cbt | Compressed | Comic Book TAR File |
| .cbt | Misc | Computer Based Training File |
| .cbz | Compressed | Comic Book ZIP Archive |
| .cc | Manufacturer | C++ Source Code File |
| .ccd | Disk Image | CloneCD Disk Image |
| .ccf | Encoded | CryptLoad Container File |
| .cch | Data | Corel Chart File |
| .ccn | Manufacturer | Compressed Multimedia Fusion File |
| .ccp | Data | RIB Import Converter Profile |
| .ccr | Data | ASTM Continuity of Care Record |
| .ccscc | Manufacturer | ClearCase Source Control Info File |
| .cct | Data | Director Protected Cast Resource |
| .ccx | Plugin | Click & Create Extension |
| .cd | Manufacturer | Visual Studio Class Diagram |
| .cd | Disk Image | CD-i OptImage |
| .cd2 | Page Layout | Click’N Design 3d File |
| .cd5 | Raster Image | Chasys Draw Image File |
| .cda | Audio | CD Audio Track Shortcut |
| .cdb | Database | Pocket Access Database |
| .cdb | Database | Symbian Phonebook Database |
| .cdb | Database | CardScan Contacts Database |
| .cdc | Raster Image | AutoCAD DesignCenter Preview Cache File |
| .cdd | Vector Image | ConceptDraw PRO Document |
| .cdda | Audio | CD Digital Audio File |
| .cdf | Data | Content Definition File |
| .cdf | Data | Nominal Small Business Accounting Company Data File |
| .cdf | Web | Channel Definition Format |
| .cdf | Data | Common Data Format |
| .cdg | Raster Image | Compact Disc Plus Graphics Image |
| .cdi | Disk Image | DiscJuggler Disc Image |
| .cdl | CAD | CADKEY Wireframe Design File |
| .cdl | Plugin | ConceptDraw PRO Library File |
| .cdmm | Vector Image | ConceptDraw MINDMAP Document |
| .cdmp | System | WCS Device Model Profile |
| .cdmt | Vector Image | ConceptDraw MINDMAP Template |
| .cdmtz | Vector Image | Compressed ConceptDraw MINDMAP Template |
| .cdmz | Vector Image | Compressed ConceptDraw MINDMAP Document |
| .cdp | Data | CD/Spectrum Pro File |
| .cdp | Game | Trainz Simulator Content Dispatcher Pack |
| .cdp2 | Game | Trainz Classics Content Dispatcher Pack 2 |
| .cdr | Data | Crash Data Retrieval Data File |
| .cdr | Audio | Raw Audio CD Data |
| .cdr | Vector Image | CorelDRAW Image File |
| .cdr | Disk Image | Macintosh DVD/CD Master |
| .cdt | Vector Image | ConceptDraw PRO Template |
| .cdt | Settings | CorelDRAW Image Template |
| .cdx | Vector Image | CorelDRAW Compressed File |
| .cdx | Vector Image | ConceptDraw PRO XML Document |
| .cdx | Data | Compound Index File |
| .ce | Raster Image | ComputerEyes Image |
| .ceb | Misc | Apabi eBook File |
| .cedprj | Page Layout | Ashampoo CoverEditor Project |
| .cel | Audio | Audition Loop |
| .cel | CAD | MicroStation Cell Library |
| .cel | Data | Battery 3 Drum Cell File |
| .celtx | Data | Celtx Project File |
| .cer | Web | Internet Security Certificate |
| .cfa | Audio | Adobe Conformed Audio File |
| .cfc | Manufacturer | ColdFusion Component File |
| .cfg | Settings | Citrix Server Connection File |
| .cfg | Settings | MAME Configuration File |
| .cfg | Settings | Configuration File |
| .cfge | Game | Jewel Quest Configuration File |
| .cfl | Misc | IMVU Product File |
| .cfm | Web | ColdFusion Markup File |
| .cfml | Web | ColdFusion Markup Language File |
| .cfr | Game | Cross Fire Replay File |
| .cfs | Data | CFS Console File |
| .cfs | Disk Image | Compact File Set Archive |
| .cgf | Game | Far Cry Model File |
| .cgi | Executable | Common Gateway Interface Script |
| .cgm | Vector Image | Computer Graphics Metafile |
| .cgp | Encoded | PixelCryptor Encrypted File |
| .cgr | Settings | Quest3D Channel Group File |
| .cgz | Game | AssaultCube Map File |
| .cgz | System | Linux Drivers Archive |
| .ch3 | Page Layout | Harvard Graphics DOS Chart File |
| .cha | Settings | Photoshop Channel Mixture |
| .cha | Font | Character Layout File |
| .cha | Web | Online Chat Configuration File |
| .charset | Text | Character Set |
| .chat | Web | Online Chat Configuration File |
| .chd | Game | MAME Hard Disk Image |
| .chef | Manufacturer | Chef Source Code File |
| .chg | Data | Quicken Online Data File |
| .chk | Data | InterCheck Checksum Database |
| .chk | Misc | Saved File Fragment |
| .chk | Game | StarCraft Chunk File |
| .chl | Settings | WinFast PVR2 Channel List |
| .chm | Web | Compiled HTML Help File |
| .chml | Encoded | Chameleon Encrypted Database File |
| .chn | Data | Ethnograph Data |
| .chord | Text | Song Chords File |
| .chr | Font | Borland Character Set |
| .chr | 3D Image | 3ds Max Characters File |
| .cht | Game | SNES Cheat File |
| .chw | Misc | Compiled Help Index File |
| .chx | Settings | AutoCAD Standards Check File |
| .cidb | Audio | iTunes CD Information File |
| .cif | Disk Image | Easy CD Creator Disk Image |
| .cil | Vector Image | ClipArt Gallery Packaged File |
| .cimg | Raster Image | CImg Image File |
| .cin | Raster Image | Kodak Cineon Bitmap File |
| .cit | Raster Image | Intergraph Bitmap Image File |
| .ck9 | Backup | Cook’n Cookbook Backup File |
| .ckd | CAD | Kubotek Design Container |
| .ckt | Data | CircuitMaker File |
| .cl2 | Data | HY-TEK Meet Results File |
| .cl4 | Data | Easy CD Creator 4 Project File |
| .cl5 | Disk Image | Easy CD Creator 5 Saved Project |
| .class | Manufacturer | Java Class File |
| .classlist | Data | SMART Notebook Class List File |
| .clb | Data | ICQ Contact List |
| .clb | System | COM+ Catalog File |
| .cld | Page Layout | Canon CD Label Template |
| .clg | Data | Collage Maker Project File |
| .clg | Settings | Windows Catalog File |
| .clix | Data | CLIX Command File |
| .clk | Data | Corel R.A.V.E Project File |
| .clkk | Misc | Clicker Keyboard |
| .clkt | Misc | Clicker Template |
| .clkw | Misc | Clicker Word Bank |
| .clkx | Misc | Clicker Grid Set |
| .clm | Data | MagicJack Call Log File |
| .clm | Data | GenePattern CEL Descriptor File |
| .clp | Data | Windows Clipboard File |
| .clpi | Video | Blu-ray Clip Information File |
| .clr | Misc | Flash Color Set |
| .clr | Settings | Vue Color Maps File |
| .clr | Settings | CryptLoad Router Information File |
| .cls | Manufacturer | Program Class File |
| .cls | Misc | LaTeX Document Class File |
| .clx | Data | Standard Dictionary File |
| .clx | Encoded | Ceelox SecureMail Secure Message |
| .cm | Game | CLEO Custom Mission |
| .cm | Settings | Cable Modem Configuration File |
| .cm2 | 3D Image | Poser Camera Set File |
| .cmbl | Data | Logger Pro Data File |
| .cmd | Executable | Windows Command File |
| .cmf | Audio | Creative Music Format |
| .cml | Data | Chemical Markup Language File |
| .cmm | Misc | Corel Multimedia Manager Album |
| .cmmp | Video | Camtasia MenuMaker Project |
| .cmmtpl | Video | Camtasia MenuMaker Template |
| .cmp | CAD | Solid Edge Wire Harness File |
| .cmp | CAD | Generic CADD Component File |
| .cmproj | Video | Camtasia Project File |
| .cmrec | Video | Camtasia Recording |
| .cms | Web | Content Management System |
| .cmx | Vector Image | Corel Metafile Exchange Image File |
| .cmz | 3D Image | Compressed Poser Camera Set File |
| .cn1 | Data | CNR Modem Initialization Data File |
| .cna | Data | Catena Project File |
| .cnc | CAD | CNC Machine Tool Path |
| .cnf | Settings | Telnet Configuration File |
| .cnt | System | Help Contents File |
| .cnv | Vector Image | Canvas 6-8 Drawing File |
| .cob | Manufacturer | COBOL Source Code File |
| .cod | Text | Atlantis Word Processor Encrypted Document |
| .cod | Manufacturer | Compiled Source Code |
| .col | Game | Grand Theft Auto Collision File |
| .collection | Data | Adobe Bridge Collection File |
| .colorpicker | Plugin | Color Picker Plugin |
| .com | Executable | DOS Command File |
| .comicdoc | Page Layout | Comic Life Document |
| .component | Plugin | Mac OS X System Component |
| .compositefont | Font | Windows Composite Font File |
| .con | Web | Concept Application Source File |
| .con | Game | Battlefield 1942 Configuration File |
| .conf | Settings | Unix Configuration File |
| .conf | Settings | Generic Configuration File |
| .config | Manufacturer | Configuration File |
| .contact | Data | Windows Contact File |
| .contour | Misc | Contour Screenplay File |
| .copy | Audio | Sony Ericsson Protected Content File |
| .cor | Data | Trimble Corrected SSF File |
| .cos2 | Misc | Pinnacle Studio Cache File |
| .cox | Plugin | Click & Create Extension |
| .cp | Manufacturer | Captivate Source File |
| .cp | Manufacturer | Xcode C++ Source File |
| .cp3 | Misc | Grand Prix 3 Cockpit Shape File |
| .cp9 | Compressed | ChoicePoint Encrypted File |
| .cpa | CAD | CADSTAR PCB Archive File |
| .cpc | Raster Image | CPC Compressed Image File |
| .cpd | Raster Image | Compressed PhotoDefiner Image File |
| .cpg | Raster Image | Manga Studio Page File |
| .cpg | Game | StarCraft Campaign File |
| .cpgz | Compressed | Compressed CPIO Archive |
| .cph | Page Layout | Corel Print House File |
| .cpi | Video | AVCHD Video Clip Information File |
| .cpi | System | Codepage Information File |
| .cpio | Encoded | Unix CPIO Archive |
| .cpl | System | Windows Control Panel Item |
| .cpmz | Data | Miradi/ConPro Project File |
| .cpn | Game | Age of Mythology Campaign File |
| .cpp | Manufacturer | C++ Source Code File |
| .cpr | Audio | Cubase Project |
| .cps | Raster Image | Corel Photo House File |
| .cpt | Raster Image | Corel Photo-Paint Document |
| .cpt | Misc | Pocket Slides Presentation |
| .cpt | Audio | DTS Compact Audio File |
| .cpt | Compressed | Compact Pro Archive |
| .cpt | Encoded | Ccrypt Encrypted Archive |
| .cptl | Data | Adobe Captivate Project Template File |
| .cptx | Data | Adobe Captivate Project File |
| .cpx | Settings | Oracle ADF Binding Context File |
| .cpx | Game | Rise of Rome Campaign File |
| .cpx | Raster Image | Corel CMX Compressed File |
| .cpy | Page Layout | eCopy Desktop File |
| .cr2 | 3D Image | Poser Character Rigging File |
| .cr2 | Raster Image | Canon Raw Image File |
| .crash | System | Mac OS X Crash Log File |
| .crashed | Misc | AbiWord Crash-Saved Document |
| .crc | Misc | Total Commander Checksum File |
| .crd | Misc | Windows CardSpace File |
| .crd | Text | Guitar Tabs |
| .crdownload | Web | Chrome Partially Downloaded File |
| .crds | Backup | Windows CardSpace Backup File |
| .crev | Data | Adobe Captivate Commentable SWF File |
| .crs | Game | StepMania Course File |
| .crt | Web | Security Certificate |
| .crtx | Data | Office 2007 Chart Template File |
| .crw | Raster Image | Canon Raw CIFF Image File |
| .crwl | Text | Windows Crawl File |
| .crx | Plugin | Chrome Extension |
| .crz | 3D Image | Compressed Poser Character Rigging File |
| .cs | Manufacturer | Visual C# Source Code File |
| .cs | Game | CLEO Custom Script |
| .csa | Data | PNA Code Calset File |
| .csd | Page Layout | Compact Shared Document |
| .csf | Settings | Adobe Color Settings File |
| .csf | Raster Image | Content Secure Format |
| .csh | Audio | Cubase Waveform File |
| .csh | Misc | Photoshop Custom Shapes File |
| .csh | Executable | C Shell Script |
| .csi | Manufacturer | EdLog Program Data File |
| .csi | Manufacturer | ContentServ Include File |
| .csm | 3D Image | Character Studio Marker File |
| .csn | Manufacturer | Adobe Code Snippet Document |
| .cso | Disk Image | Compressed ISO Disk Image |
| .csp | Web | Concept Server Page |
| .csproj | Manufacturer | Visual Studio C# Project |
| .csr | Web | Certificate Signing Request File |
| .css | Web | Cascading Style Sheet |
| .cst | Manufacturer | ContentServ Template |
| .cst | Settings | Canvas Custom Set File |
| .csv | Data | Comma Separated Values File |
| .csy | Vector Image | Canvas Symbol File |
| .ct | Game | Cheat Engine Cheat Table |
| .ct | Raster Image | Scitex Continuous Tone File |
| .ctb | Settings | AutoCAD Color-Based Plot Style File |
| .ctf | Data | WhereIsIt Catalog |
| .ctf | Misc | Content Transformation File |
| .ctf | Misc | AVG Update Control File |
| .ctg | Misc | Canon Digital Camera Catalog File |
| .ctl | Manufacturer | Visual Basic UserControl Object File |
| .ctl | Data | StepMania SMZIP Package Description File |
| .ctm | Game | Star Wars Republic Commando Map File |
| .ctm | Data | CrazyTalk Model File |
| .ctp | Manufacturer | CakePHP Template |
| .ctt | Data | Messenger Contact List |
| .ctx | Manufacturer | Visual Basic Control Binary File |
| .cty | Game | SimCity City File |
| .cue | Disk Image | Cue Sheet File |
| .cue | Disk Image | CDRWin Cue Sheet |
| .cui | Settings | Autodesk Custom Workspace File |
| .cuix | Settings | AutoCAD Custom User Interface File |
| .cul | Misc | Windows Cursor Library |
| .cur | System | Windows Cursor |
| .cursorfx | Data | CursorFX Theme File |
| .curxptheme | Data | CursorXP Theme File |
| .cus | Settings | AutoCAD Custom Dictionary File |
| .cut | Raster Image | Dr. Halo Bitmap Image File |
| .cv5 | Vector Image | Canvas 5 Drawing File |
| .cva | Data | Canvas Sequence Set |
| .cva | Settings | HP Systems Software Manager Information File |
| .cvc | Video | cVideo |
| .cvd | Data | ClamAV Virus Definitions File |
| .cvf | Misc | CPU-Z Validation File |
| .cvg | Vector Image | Calamus Vector Graphic File |
| .cvi | GIS | CassiniVision Map Image File |
| .cvi | Vector Image | Canvas Image Format |
| .cvn | Data | CineVision Encoding Session |
| .cvs | Vector Image | Canvas 3 Drawing File |
| .cvt | Plugin | Canvas External Tool File |
| .cvx | Vector Image | Canvas Drawing File |
| .cwf | Settings | CorelDRAW Workspace File |
| .cwk | Data | ClarisWorks Document |
| .cwp | Audio | Cakewalk SONAR Project |
| .cws | Text | Claris Works Template |
| .cwz | Data | Circuit Wizard File |
| .cxt | Data | Director Protected Cast File |
| .cxx | Manufacturer | C++ Source Code File |
| .cyi | Text | Clustify Input File |
| .cyo | Data | Clustify Output File |
| .cys | Data | Clustify Summary File |
| .cyw | Executable | Rbot.CYW Worm File |