File extensions beginning with the letter C. Commonly used extensions are listed in bold.

	C  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z .c C/C++ Source Code File (more info) .c Lite-C Script (more info) .c00 WinAce Split Archive File (more info) .c01 Typhoon Wave Audio File (more info) .c01 WinAce Split Archive Part 1 File (more info) .c02 WinAce Split Archive Part 1 File (more info) .c2d WinOnCD Disc Image (more info) .c4 JEDMICS Image File (more info) .c4d Cinema 4D Model File (more info) .ca Initial Telnet Cache (more info) .cab Windows Cabinet File (more info) .cache Cache File (more info) .caf Core Audio File (more info) .cag ClipArt Gallery Package (more info) .cal CALS Raster Graphic (more info) .cal Calendar File (more info) .calb Coolect Album File (more info) .cals CALS Raster Graphic File (more info) .cam CASIO Digital Camera Picture File (more info) .cam Gerber CAM Job File (more info) .camrec Camtasia Studio Screen Recording (more info) .can Canon Navigator Fax Document (more info) .cap Packet Capture File (more info) .cap Construct Game Development File (more info) .car CAR Archive (more info) .cat Advanced Disk Catalog Database (more info) .catpart CATIA V5 Part File (more info) .cb7 Comic Book 7-Zip Archive (more info) .cbf Calendar Builder File (more info) .cbf ChessBase Game Information File (more info) .cbg CyberGauge Data File (more info) .cbk Backup Configuration File (more info) .cbl COBOL Program (more info) .cbr Comic Book RAR Archive (more info) .cbt Computer Based Training File (more info) .cbt Comic Book TAR File (more info) .cbz Comic Book ZIP Archive (more info) .cc C++ Source Code File (more info) .ccd CloneCD Disk Image (more info) .ccf CryptLoad Container File (more info) .cch Corel Chart File (more info) .ccn Compressed Multimedia Fusion File (more info) .ccr ASTM Continuity of Care Record (more info) .cct Director Protected Cast Resource (more info) .ccx Click & Create Extension (more info) .cd Visual Studio Class Diagram (more info) .cd CD-i OptImage (more info) .cd2 Click'N Design 3d File (more info) .cd5 Chasys Draw Image File (more info) .cda CD Audio Track Shortcut (more info) .cdf Nominal Small Business Accounting Company Data File (more info) .cdf Common Data Format (more info) .cdf Content Definition File (more info) .cdf Channel Definition Format (more info) .cdi DiscJuggler Disc Image (more info) .cdr Crash Data Retrieval Data File (more info) .cdr Raw Audio CD Data (more info) .cdr Macintosh DVD/CD Master (more info) .cdr CorelDRAW Image File (more info) .cdt CorelDRAW Image Template (more info) .cdx Compound Index File (more info) .ce ComputerEyes Image (more info) .ceb Apabi eBook File (more info) .cel Audition Loop (more info) .cel MicroStation Cell Library (more info) .celtx Celtx Project File (more info) .cer Internet Security Certificate (more info) .cfg Citrix Server Connection File (more info) .cfg Configuration File (more info) .cfl IMVU Product File (more info) .cfm ColdFusion Markup File (more info) .cgf Far Cry Model File (more info) .cgi Common Gateway Interface Script (more info) .cgm Computer Graphics Metafile (more info) .cgp PixelCryptor Encrypted File (more info) .cgr Quest3D Channel Group File (more info) .cgz Linux Drivers Archive (more info) .cgz AssaultCube Map File (more info) .cha Online Chat Configuration File (more info) .cha Photoshop Channel Mixture (more info) .cha Character Layout File (more info) .charset Character Set (more info) .chat Online Chat Configuration File (more info) .chg Quicken Online Data File (more info) .chk InterCheck Checksum Database (more info) .chk Saved File Fragment (more info) .chk StarCraft Chunk File (more info) .chl WinFast PVR2 Channel List (more info) .chm Compiled HTML Help File (more info) .chml Chameleon Encrypted Database File (more info) .chn Ethnograph Data (more info) .chord Song Chords File (more info) .chr Borland Character Set (more info) .cht SNES Cheat File (more info) .chw Compiled Help Index File (more info) .cidb iTunes CD Information File (more info) .cif Easy CD Creator Disk Image (more info) .cil ClipArt Gallery Packaged File (more info) .cin Kodak Cineon Bitmap File (more info) .cit Intergraph Bitmap Image File (more info) .ckd Kubotek Design Container (more info) .ckt CircuitMaker File (more info) .cl5 Easy CD Creator 5 Saved Project (more info) .class Java Class File (more info) .cld Canon CD Label Template (more info) .clix CLIX Command File (more info) .clkk Clicker Keyboard (more info) .clkt Clicker Template (more info) .clkw Clicker Word Bank (more info) .clkx Clicker Grid Set (more info) .clp Windows Clipboard File (more info) .clr CryptLoad Router Information File (more info) .clr Flash Color Set (more info) .cls Program Class File (more info) .clx Ceelox SecureMail Secure Message (more info) .cm CLEO Custom Mission (more info) .cm Cable Modem Configuration File (more info) .cm2 Poser Camera Set File (more info) .cmd Windows Command File (more info) .cmf Creative Music Format (more info) .cmm Corel Multimedia Manager Album (more info) .cmp Solid Edge Wire Harness File (more info) .cmp Generic CADD Component File (more info) .cms Content Management System (more info) .cmx Corel Metafile Exchange Image File (more info) .cmz Compressed Poser Camera Set File (more info) .cna Catena Project File (more info) .cnc CNC Machine Tool Path (more info) .cnf Telnet Configuration File (more info) .cnt Help Contents File (more info) .cnv Canvas 6-8 Drawing File (more info) .cob COBOL Source Code File (more info) .cod Compiled Source Code (more info) .col Grand Theft Auto Collision File (more info) .colorpicker Color Picker Plugin (more info) .com DOS Command File (more info) .comicdoc Comic Life Document (more info) .component Mac OS X System Component (more info) .con Concept Application Source File (more info) .conf Unix Configuration File (more info) .config Configuration File (more info) .copy Sony Ericsson Protected Content File (more info) .cox Click & Create Extension (more info) .cp Captivate Source File (more info) .cp Xcode C++ Source File (more info) .cp3 Grand Prix 3 Cockpit Shape File (more info) .cp9 ChoicePoint Encrypted File (more info) .cpc CPC Compressed Image File (more info) .cpd Compressed PhotoDefiner Image File (more info) .cpg StarCraft Campaign File (more info) .cpgz Compressed CPIO Archive (more info) .cph Corel Print House File (more info) .cpi Codepage Information File (more info) .cpio Unix CPIO Archive (more info) .cpl Windows Control Panel (more info) .cpmz Miradi/ConPro Project File (more info) .cpp C++ Source Code File (more info) .cpr Cubase Project (more info) .cps Corel Photo House File (more info) .cpt Ccrypt Encrypted Archive (more info) .cpt Corel Photo-Paint Document (more info) .cpt Pocket Slides Presentation (more info) .cpt Compact Pro Archive (more info) .cr2 Canon Raw Image File (more info) .cr2 Poser Character Rigging File (more info) .crd Windows Cardfile (more info) .crd Guitar Tabs (more info) .crt Security Certificate (more info) .crw Canon Raw CIFF Image File (more info) .crwl Windows Crawl File (more info) .crx Chrome Extension (more info) .crz Compressed Poser Character Rigging File (more info) .cs CLEO Custom Script (more info) .cs Visual C# Source Code File (more info) .csa PNA Code Calset File (more info) .csd Compact Shared Document (more info) .csf Content Secure Format (more info) .csf Adobe Color Settings File (more info) .csh C Shell Script (more info) .csh Photoshop Custom Shapes File (more info) .csh Cubase Waveform File (more info) .csi ContentServ Include File (more info) .csi EdLog Program Data File (more info) .csm Character Studio Marker File (more info) .cso Compressed ISO Disk Image (more info) .csp Concept Server Page (more info) .csproj Visual Studio C# Project (more info) .css Cascading Style Sheet (more info) .cst ContentServ Template (more info) .csv Comma Separated Values File (more info) .ctf AVG Update Control File (more info) .ctf WhereIsIt Catalog (more info) .ctf Content Transformation File (more info) .ctg Canon Digital Camera Catalog File (more info) .ctl Visual Basic UserControl Object File (more info) .ctt Messenger Contact List (more info) .ctx Visual Basic Control Binary File (more info) .cty SimCity City File (more info) .cue Cue Sheet File (more info) .cue CDRWin Cue Sheet (more info) .cui Autodesk Custom Workspace File (more info) .cur Windows Cursor (more info) .cut Dr. Halo Bitmap Image File (more info) .cv5 Canvas 5 Drawing File (more info) .cvc cVideo (more info) .cvg Calamus Vector Graphic File (more info) .cvi CassiniVision Map Image File (more info) .cvi Canvas Image Format (more info) .cvn CineVision Encoding Session (more info) .cvs Canvas 4 Drawing File (more info) .cvx Canvas Drawing File (more info) .cwf CorelDRAW Workspace File (more info) .cwk ClarisWorks Document (more info) .cwp Cakewalk SONAR Project (more info) .cws Claris Works Template (more info) .cwz Circuit Wizard File (more info) .cxt Director Protected Cast File (more info) .cyi Clustify Input File (more info) .cyo Clustify Output File (more info) .cys Clustify Summary File (more info) .cyw Rbot.CYW Worm File (more info)

All File Extensions | "C" Computer Terms

Looking for a file extension that isn't listed here? Send in your suggestion!

Other Help Center Resources:

Computer Questions and Answers | List of Domain Suffixes