C File Extensions
Browse file types with extensions beginning with C.
| Extension | File Type | Popularity |
|---|---|---|
| .C | C/C++ Source Code File | 4.1 |
| .C | Lite-C Script | 2.7 |
| .C00 | WinAce Split Archive File | 3.8 |
| .C01 | WinAce Split Archive Part 1 File | 3.4 |
| .C01 | Typhoon Wave Audio File | 2.0 |
| .C10 | WinAce Split Archive Part 10 | 3.0 |
| .C2R | Windows Media Center Click-To-Record File | 4.0 |
| .C32 | Syslinux COM32 Module | 3.9 |
| .C3D | Coordinate 3D File | 4.7 |
| .C3Z | OpenQwaq 3D Model File | 3.2 |
| .C4D | Cinema 4D Model | 4.3 |
| .C4P | CrossOver Software Installer File | 3.6 |
| .CAB | Windows Cabinet File | 3.9 |
| .CACHE | Cache File | 3.8 |
| .CAD | BobCAD-CAM File | 4.1 |
| .CADC | Corpatla Data Container File | 2.7 |
| .CADQ | CADQ Ransomware Encrypted File | 2.0 |
| .CAF | Core Audio File | 3.5 |
| .CAF | Class Action Gradebook File | 2.5 |
| .CAF | Cal3D Binary Animation File | 1.8 |
| .CAF | Cathy Catalog File | 3.0 |
| .CAF | CryENGINE Character Animation File | 3.1 |
| .CAFF | Core Audio File | 3.5 |
| .CAJ | Chinese Academic Journal File | 3.1 |
| .CAL | 3ds Max Pose Adjustment File | 3.3 |
| .CAL | CryENGINE Character Animation List | 2.0 |
| .CALCA | Calca Document | 3.0 |
| .CALIBRE | Calibre Device Data File | 3.7 |
| .CAM | Gerber CAM Job File | 3.3 |
| .CAMM | espresso Mind Map Document | 2.7 |
| .CAMP | WCS Color Appearance Model Profile File | 3.3 |
| .CAMPAIGN | Wee Tanks! Campaign | 4.5 |
| .CAMPROJ | Camtasia Studio Project | 3.8 |
| .CAMREC | Camtasia Studio Screen Recording | 3.6 |
| .CAMV | Camtasia Video File | 3.5 |
| .CAN | Canon Navigator Fax Document | 3.8 |
| .CAP | Packet Capture File | 3.2 |
| .CAPOBUNDLE | Capo Project | 3.0 |
| .CAPROJ | Construct Project File | 4.0 |
| .CAPT | Capito Data File | 4.0 |
| .CAPX | Capella CapXML Score | 3.8 |
| .CAPX | Construct Compressed Project File | 3.9 |
| .CAR | Compiled Asset Catalog | 3.3 |
| .CAR | Car Explorer Data File | 3.1 |
| .CARC | Nintendo Compressed Archive File | 3.8 |
| .CAS | Autodesk Cascade License File | 3.4 |
| .CAT | Windows Catalog File | 3.7 |
| .CATDRAWING | CATIA V5 Drawing | 3.3 |
| .CATPART | CATIA V5 Part File | 3.4 |
| .CATPRODUCT | CATIA V5 Assembly File | 3.8 |
| .CAV | Comodo Virus Definitions File | 3.7 |
| .CAWR | Espresso workreport Document | 2.0 |
| .CBA | Comic Book ACE Archive | 3.0 |
| .CBA | CryENGINE Resource Compiler Settings File | 2.0 |
| .CBDS | Comic Book DS File | 4.5 |
| .CBF | Calendar Builder File | 3.0 |
| .CBG | ChessBase Game Moves File | 3.6 |
| .CBH | ChessBase Database Header File | 3.3 |
| .CBL | COBOL Source Code File | 3.1 |
| .CBMAP | Containment Breach Map File | 4.3 |
| .CBOR | Concise Binary Object Representation | 3.0 |
| .CBP | Code::Blocks Project File | 3.6 |
| .CBR | Comic Book RAR Archive | 3.9 |
| .CBS | Comodo Backup Script | 2.3 |
| .CBT | Comic Book TAR File | 3.3 |
| .CBU | Comodo Backup File | 4.0 |
| .CBV | ChessBase Database File | 3.7 |
| .CBZ | Comic Book Zip Archive | 3.7 |
| .CBZ | ChessBase Encrypted Database Archive | 2.0 |
| .CC | C++ Source Code File | 3.9 |
| .CC3.SB3 | ClipCC Project | 3.0 |
| .CCA | Multimedia Fusion File | 3.0 |
| .CCB | CopperCube 3D Scene | 3.3 |
| .CCD | CloneCD Control File | 3.7 |
| .CCF | CryptLoad Container File | 3.0 |
| .CCGAME | XNA Creators Club Game Package | 2.1 |
| .CCH | .NET Security Resolution Cache File | 3.1 |
| .CCIP | Curse Client Install Package | 4.3 |
| .CCLD | Construction Clouds Data File | 2.8 |
| .CCN | Compressed Multimedia Fusion File | 3.3 |
| .CCP | CopperCube JavaScript File | 4.0 |
| .CCP | CodeCharge Studio Page File | 3.0 |
| .CCS | CodeCharge Studio Project File | 3.8 |
| .CCX | Click & Create Extension | 2.5 |
| .CD | Visual Studio Class Diagram | 3.9 |
| .CD2 | Click'N Design 3D File | 3.0 |
| .CD5 | Chasys Draw Image File | 3.0 |
| .CDA | CD Audio Track Shortcut | 3.4 |
| .CDB | Symbian Phonebook Database | 3.8 |
| .CDB | Pocket Access Database | 4.0 |
| .CDB | CardScan Contacts Database | 3.3 |
| .CDD | ConceptDraw DIAGRAM Document (Legacy) | 3.6 |
| .CDDA | CD Digital Audio File | 3.5 |
| .CDDX | Circuit Diagram Document | 3.1 |
| .CDDZ | ConceptDraw DIAGRAM Document | 3.1 |
| .CDF | Common Data Format | 3.2 |
| .CDF | Affymetrix Chip Definition File | 2.7 |
| .CDF | CryENGINE Character Definition File | 3.3 |
| .CDF | NetCDF Format File | 3.2 |
| .CDF-MS | ClickOnce Compiled Manifest File | 3.3 |
| .CDG | Compact Disc Plus Graphics Image | 3.8 |
| .CDI | INTEX Output File | 4.4 |
| .CDL | CADKEY Wireframe Design File | 3.4 |
| .CDLX | Adobe Audition CD Layout File | 3.5 |
| .CDML | Creately Diagram File | 3.0 |
| .CDMZ | ConceptDraw MINDMAP Document | 3.6 |
| .CDO | Crescendo Music Notation File | 4.0 |
| .CDOC | Clicker Document | 3.0 |
| .CDOC | Encrypted DigiDoc File | 3.6 |
| .CDP | Trainz Simulator Content Dispatcher Pack | 4.1 |
| .CDP | CD/Spectrum Pro File | 3.8 |
| .CDP2 | Trainz Classics Content Dispatcher Pack 2 | 2.2 |
| .CDPZ | ConceptDraw PROJECT Document | 3.3 |
| .CDR | CorelDRAW File | 3.8 |
| .CDR | Raw CD Audio Data | 3.5 |
| .CDR | Macintosh DVD/CD Master | 3.5 |
| .CDRT | CorelDRAW Template | 3.0 |
| .CDSZ | ConceptDraw DIAGRAM SlideShow | 3.0 |
| .CDT | CorelDRAW Template (Legacy) | 3.3 |
| .CDTC | 3DS Super Mario Maker Course Data File | 2.5 |
| .CDTZ | ConceptDraw DIAGRAM Template | 3.0 |
| .CDW | KOMPAS Document | 3.6 |
| .CDX | ChemDraw Exchange File | 3.1 |
| .CDX | Compound Index File | 3.9 |
| .CDXML | ChemDraw XML File | 2.8 |
| .CDXML | Cmdlet Definition XML File | 1.5 |
| .CEBX | Apabi XML eBook File | 3.0 |
| .CED | JVC Camera Video Data File | 3.3 |
| .CEF | CenturionMail Encrypted Package | 3.0 |
| .CEL | Affymetrix Probe Results File | 3.9 |
| .CEL | Celestia Script File | 3.6 |
| .CEL | Audition Loop | 1.5 |
| .CEL | Battery 3 Drum Cell File | 1.3 |
| .CELL | Thinkfree Office NEO Cell Workbook | 3.5 |
| .CELTX | Celtx Project File | 3.3 |
| .CELX | Celestia Script | 3.9 |
| .CENON~ | Cenon Backup File | 3.0 |
| .CEOL | Bosca Ceoil Song | 4.5 |
| .CER | Internet Security Certificate | 3.4 |
| .CERBER | Cerber Ransomware Encrypted File | 3.3 |
| .CERBER2 | Cerber2 Ransomware Encrypted File | 3.7 |
| .CERBER3 | Cerber Ransomware Virus File | 2.3 |
| .CEX | SolidWorks Enterprise PDM Vault Export File | 4.1 |
| .CFA | Adobe Conformed Audio File | 3.2 |
| .CFA | ComProbe Analyzer Capture File | 3.6 |
| .CFB | Compound Binary File | 3.0 |
| .CFC | ColdFusion Component File | 2.4 |
| .CFG | Configuration File | 4.2 |
| .CFG | Citrix Server Connection File | 4.2 |
| .CFG | Source Engine Configuration File | 4.3 |
| .CFG | Cal3D Model Configuration File | 4.2 |
| .CFG | Celestia Configuration File | 4.2 |
| .CFL | IMVU Product File | 3.3 |
| .CFM | ColdFusion Markup File | 3.4 |
| .CFS | Compact File Set Archive | 4.0 |
| .CFX | Flow-Cal Data File | 3.0 |
| .CG | Cg Program | 3.8 |
| .CG3 | Cabri 3D Document | 3.8 |
| .CGA | Crytek Geometry Animation File | 2.0 |
| .CGF | Crytek Geometry Format File | 3.9 |
| .CGFX | CgFX Shader File | 3.6 |
| .CGI | Common Gateway Interface Script | 3.8 |
| .CGM | Computer Graphics Metafile | 2.7 |
| .CGR | CATIA Graphical Representation File | 3.4 |
| .CGRP | Pro Tools Clip Group File | 4.0 |
| .CGZ | Linux Drivers Archive | 4.0 |
| .CGZ | Cube Map File | 4.2 |
| .CHA | IRC Chat Configuration | 3.5 |
| .CHARSET | Character Set | 3.3 |
| .CHAT | IRC Chat Configuration File | 3.7 |
| .CHD | Compressed Hunks of Data File | 3.8 |
| .CHITUBOX | Chitubox Project | 3.0 |
| .CHK | Saved File Fragment | 3.9 |
| .CHK | StarCraft Chunk File | 3.2 |
| .CHK | Netgear Router Firmware File | 3.3 |
| .CHL | WinFast PVR2 Channel List | 3.8 |
| .CHM | Compiled HTML Help File | 3.7 |
| .CHML | Chameleon Encrypted Database File | 2.5 |
| .CHORD | Song Chords File | 3.1 |
| .CHPROJ | Adobe Character Animator Project | 4.0 |
| .CHR | 3ds Max Characters File | 3.6 |
| .CHR | CryENGINE Character File | 3.8 |
| .CHROMAEFFECTS | Synapse 3 Chroma Configuration | 4.0 |
| .CHRPARAMS | CryENGINE Character Parameters File | 2.0 |
| .CHUNK001 | File Splitter Split Archive Part 1 | 3.3 |
| .CHW | Compiled Help Index File | 3.9 |
| .CHX | AutoCAD Standards Check File | 4.0 |
| .CID | Navigator Chart Image Description File | 3.0 |
| .CIDB | iTunes CD Information File | 3.7 |
| .CIF | Crystallographic Information File | 3.8 |
| .CIL | Clip Gallery Packaged File | 2.7 |
| .CIN | Kodak Cineon Bitmap Image | 3.1 |
| .CINE | Phantom Digital Video File | 3.9 |
| .CIP | Cavena Subtitles File | 2.0 |
| .CIRC | Logisim Circuit File | 3.7 |
| .CISO | Compact ISO File | 3.0 |
| .CIT | Intergraph CCITT Image | 3.3 |
| .CK3 | Crusader Kings III Saved Game | 3.0 |
| .CK9 | Cook'n Cookbook Backup File | 3.8 |
| .CKB | Cricket Audio Bank File | 3.7 |
| .CKD | KeyCreator Design File | 2.3 |
| .CKP | SQL Server Checkpoint File | 2.7 |
| .CKPT | PyTorch Lightning Checkpoint | 3.8 |
| .CKT | CircuitMaker File | 3.7 |
| .CL2 | HY-TEK Meet Results File | 1.5 |
| .CL2ARC | Comic Life 2 Document Archive | 3.8 |
| .CL2LYT | Comic Life 2 Layout File | 2.7 |
| .CL2TPL | Comic Life 2 Template | 3.5 |
| .CL5 | Easy CD Creator 5 Saved Project | 3.0 |
| .CLARIFY | Clarify Document | 3.2 |
| .CLASS | Java Class File | 4.2 |
| .CLASSLIST | SMART Notebook Class List File | 2.8 |
| .CLB | COM+ Catalog File | 4.3 |
| .CLD | ClamAV Virus Definitions File | 4.0 |
| .CLD | Canon CD Label Template | 3.5 |
| .CLEO | CLEO Grand Theft Auto Mod File | 4.2 |
| .CLF | Caesium Image List | 3.0 |
| .CLG | Windows Catalog File | 3.8 |
| .CLG | Collage Maker Project File | 3.3 |
| .CLIF | Cranelift IR Format File | 3.0 |
| .CLIP | Clip Studio Paint Illustration | 4.0 |
| .CLIP | Grand Theft Auto 5 Clip | 3.2 |
| .CLIPS | Coda Clips File | 3.0 |
| .CLK | Corel R.A.V.E Project File | 3.5 |
| .CLKB | Clicker Books File | 2.5 |
| .CLKC | Clicker Connect Set File | 3.0 |
| .CLKD | Clicker Docs File | 3.7 |
| .CLKK | Clicker Keyboard | 3.7 |
| .CLKM | Clicker Matching Set File | 3.0 |
| .CLKS | Clicker Sentences File | 3.0 |
| .CLKT | Clicker Grid Set Template | 2.5 |
| .CLKTK | Clicker Talk Set File | 4.0 |
| .CLKV | Clicker Communicator Vocabulary Set File | 3.0 |
| .CLKW | Clicker Word Bank | 3.0 |
| .CLKX | Clicker Grid Set | 3.5 |
| .CLM | MagicJack Call Log File | 2.5 |
| .CLP | CrazyTalk Clip File | 3.8 |
| .CLP | Finale Clip | 2.8 |
| .CLPI | Blu-ray Clip Information File | 3.8 |
| .CLR | Animate Color Set | 2.3 |
| .CLR | CryptLoad Router Information File | 1.4 |
| .CLS | LaTeX Document Class File | 3.9 |
| .CLS | Program Class File | 3.6 |
| .CLT | Clarity Legal Transcript File | 3.5 |
| .CLW | Visual C++ ClassWizard File | 3.5 |
| .CLX | Standard Dictionary File | 2.8 |
| .CM | CLEO Custom Mission | 4.3 |
| .CM0012 | Configuration Management File | 3.6 |
| .CM10 | CaseMap 10 Case File | 3.0 |
| .CM2 | Poser Camera Set File | 3.5 |
| .CM5 | Clone Manager File | 2.0 |
| .CMA | Coach Activity File | 3.6 |
| .CMAP | CmapTools Concept Map File | 3.7 |
| .CMATE | ControllerMate File | 3.0 |
| .CMBL | Logger Pro Data File | 3.0 |
| .CMD | Windows Command File | 4.2 |
| .CMDB | Ansys CFD Mesh | 4.3 |
| .CMF | Cal3D Binary Mesh File | 3.5 |
| .CML | CryptoMailer Encrypted File | 2.0 |
| .CML | Chemical Markup Language File | 3.6 |
| .CMM | Corel Multimedia Manager Album | 2.5 |
| .CMMP | Camtasia MenuMaker Project | 2.5 |
| .CMMTHEME | CleanMyMac Theme File | 3.0 |
| .CMMTPL | Camtasia MenuMaker Template | 3.0 |
| .CMOD | Celestia Model | 3.5 |
| .CMP | HotDocs Clause Component File | 3.5 |
| .CMP | Windows Connection Manager Profile | 3.5 |
| .CMPROJ | Camtasia macOS Project | 3.0 |
| .CMR | Coach Results File | 2.0 |
| .CMREC | Camtasia Recording | 2.5 |
| .CMX | Corel Presentation Exchange Image | 3.8 |
| .CMZ | Compressed Poser Camera Set File | 3.0 |
| .CNA | Catena Project File | 3.0 |
| .CNC | PartMaster CNC File | 3.1 |
| .CND | Melco Condensed Embroidery File | 2.8 |
| .CNDX | Avery DesignPro for Mac Label File | 2.5 |
| .CNF | MySQL Configuration File | 4.3 |
| .CNG | CryptoNG Encrypted Archive | 4.2 |
| .CNM | NoteMap Outline File | 2.5 |
| .CNS | M.U.G.E.N Character States File | 4.2 |
| .CNT | Help Contents File | 3.6 |
| .CNT | Android Cache File | 3.6 |
| .CNV | Office Converter File | 3.0 |
| .CNV | Canvas 6-8 Drawing File | 2.6 |
| .COB | COBOL Source Code File | 3.0 |
| .COD | Compiled Source Code | 3.9 |
| .CODAPLUGIN | Coda Plug-in | 2.6 |
| .CODASITE | Coda Site File | 3.0 |
| .CODE-WORKSPACE | Microsoft Visual Studio Code Multi-root Workspace | 4.0 |
| .COF | MPLAB COFF File | 3.7 |
| .COL | Capture One Session File | 4.1 |
| .COLLAB | Blackboard Collaborate Session File | 3.5 |
| .COLZ | Adobe Collage File | 2.0 |
| .COM | DOS Command File | 4.0 |
| .COMICDOC | Comic Life Document | 3.6 |
| .COMICLIFE | Comic Life Document | 3.3 |
| .COMMAND | Terminal Command File | 3.9 |
| .COMP | Fusion Composition File | 3.1 |
| .COMPILED | Compiled Game Resource File | 3.9 |
| .COMPONENT | Mac OS X System Component | 3.2 |
| .COMPOSITEFONT | Windows Composite Font File | 3.4 |
| .COMPOSITIONTEMPLATE | Invantive Composition Template | 3.4 |
| .COMPPKG.HAUPTWERK.RAR | Hauptwerk Component Package | 4.0 |
| .CON | Concept Application Source File | 3.6 |
| .CONDA | Conda Package | 1.7 |
| .CONF | Unix Configuration File | 3.9 |
| .CONF | Generic Configuration File | 3.9 |
| .CONFIG | Configuration File | 3.9 |
| .CONFIGPROFILE | Apple Configuration Profile | 3.5 |
| .CONFORM | Conformalizer Change List | 3.0 |
| .CONSIS | Sciral Consistency Document | 3.0 |
| .CONTACT | Windows Contact File | 3.9 |
| .CONTI | Conti Ransomware Encrypted File | 3.0 |
| .CONTOUR | Contour Screenplay File | 3.0 |
| .COPRESET | Capture One Preset File | 4.3 |
| .COPY | Sony Ericsson Protected Content | 4.1 |
| .COR | CorelDRAW Drawing | 2.2 |
| .COS | Capture One Settings File | 3.0 |
| .COS | Creatures CAOS File | 1.5 |
| .COSESSIONDB | Capture One Session File | 3.0 |
| .COSTYLE | Capture One Style File | 4.0 |
| .COURSE | Super Mario ReMaker Course File | 3.8 |
| .COV | Fax Cover Page File | 2.9 |
| .CP | Xcode C++ Source File | 3.3 |
| .CP | Captivate Source File | 3.0 |
| .CP3 | Grand Prix 3 Cockpit Shape File | 3.3 |
| .CP9 | ChoicePoint Encrypted File | 2.0 |
| .CPA | CADSTAR PCB Archive File | 4.1 |
| .CPAA | Captivate Shared Action File | 2.0 |
| .CPC | CPC Compressed Image File | 3.8 |
| .CPD | RoboHelp Cache Project Database | 3.8 |
| .CPDX | Adobe Captivate Storyboard Project | 4.0 |
| .CPE | Fax Cover Page File | 3.0 |
| .CPF | Cognos Project File | 3.6 |
| .CPG | Manga Studio Page File | 2.7 |
| .CPG | ESRI Code Page File | 3.5 |
| .CPG | StarCraft Campaign File | 2.5 |
| .CPGZ | Compressed CPIO Archive | 2.8 |
| .CPH | Corel Print House File | 3.3 |
| .CPI | AVCHD Video Clip Information | 3.5 |
| .CPI | Codepage Information File | 3.2 |
| .CPIO | Unix CPIO Archive | 4.2 |
| .CPK | DTM Test Log File | 4.2 |
| .CPL | Windows Control Panel Item | 3.7 |
| .CPMZ | Miradi/ConPro Project File | 2.8 |
| .CPN | Age of Mythology Campaign File | 3.9 |
| .CPP | C++ Source Code File | 4.1 |
| .CPQ | Compaq OEM Disc Configuration File | 3.5 |
| .CPR | Cubase Project | 3.5 |
| .CPR | Windows Phone Display Settings File | 3.1 |
| .CPS | Captivate Styles File | 1.4 |
| .CPS | Corel Photo House File | 1.7 |
| .CPS | The Powder Toy Save File | 4.4 |
| .CPT | Corel PHOTO-PAINT Image | 3.3 |
| .CPT | Ccrypt Encrypted Archive | 3.2 |
| .CPT | DTS Compact Audio File | 1.4 |
| .CPT | Compact Pro Archive | 2.4 |
| .CPTM | Captivate Theme File | 3.0 |
| .CPTX | Adobe Captivate Project | 3.5 |
| .CPVC | Adobe Captivate Video Composition | 3.8 |
| .CPX | Oracle ADF Binding Context File | 3.8 |
| .CPX | Corel CMX Compressed File | 2.0 |
| .CPY | 3ds Max Copy Track File | 3.4 |
| .CR | Crystal Source Code | 3.0 |
| .CR2 | Canon Raw 2 Image | 4.0 |
| .CR2 | Poser Character Rigging File | 3.2 |
| .CR3 | Canon Raw 3 Image | 3.4 |
| .CRAM | Compressed Alignment File | 2.5 |
| .CRASH | Mac OS X Crash Log File | 3.6 |
| .CRC | Total Commander Checksum File | 3.5 |
| .CRD | Windows CardSpace File | 3.2 |
| .CRDOWNLOAD | Chrome Partially Downloaded File | 4.2 |
| .CRDS | Windows CardSpace Backup File | 3.4 |
| .CREV | Adobe Captivate Commentable SWF File | 4.0 |
| .CRF | Cal3D Binary Materials File | 3.5 |
| .CRL | Certificate Revocation List File | 3.5 |
| .CRP | Cities: Skylines Colossal Raw Asset Package | 4.1 |
| .CRT | Security Certificate | 4.1 |
| .CRTR | MultiAd Creator Pro Document | 2.2 |
| .CRTX | Office 2007 Chart Template File | 3.6 |
| .CRV | VCarve Pro Design File | 2.9 |
| .CRWL | Windows Crawl File | 2.7 |
| .CRX | Chromium Extension | 4.1 |
| .CRY | CryENGINE Map File | 3.7 |
| .CRYPT | WhatsApp Encrypted Database | 3.3 |
| .CRYPT | CryptXXX Ransomware Encrypted File | 3.5 |
| .CRYPT1 | WhatsApp Encrypted Database File | 3.6 |
| .CRYPT10 | WhatsApp Encrypted Database File | 3.5 |
| .CRYPT12 | WhatsApp Encrypted Database File | 3.8 |
| .CRYPT14 | WhatsApp Encrypted Database File | 3.5 |
| .CRYPT15 | WhatsApp Encrypted Database File | 3.6 |
| .CRYPT8 | WhatsApp Encrypted Database File | 3.7 |
| .CRYPT9 | WhatsApp Encrypted Database File | 3.3 |
| .CRZ | Compressed Poser Character Rigging File | 4.5 |
| .CS | C# Source Code File | 4.3 |
| .CS | ColorSchemer Studio Color Scheme | 3.4 |
| .CS | CLEO Custom Script | 4.2 |
| .CSA | PNA Code Calset File | 2.2 |
| .CSAPLAN | SPSS Analysis Plan File | 2.0 |
| .CSB | CRIWARE Sound Bank | 3.8 |
| .CSD | Compact Shared Document | 3.7 |
| .CSD | Manga Studio Scene File | 3.3 |
| .CSF | Adobe Color Settings File | 3.5 |
| .CSF | Content Sealed Format | 2.1 |
| .CSF | GeoMedia Coordinate System File | 3.6 |
| .CSH | Photoshop Custom Shapes File | 3.8 |
| .CSH | C Shell Script | 3.4 |
| .CSH | Cubase Waveform File | 2.8 |
| .CSHTML | ASP.NET Razor Webpage | 4.1 |
| .CSI | ContentServ Include File | 3.3 |
| .CSI | EdLog Program Data File | 2.3 |
| .CSKIN | CD Art Display Skin File | 3.5 |
| .CSM | Character Studio Marker File | 3.3 |
| .CSN | Adobe Code Snippet Document | 2.7 |
| .CSO | Compressed ISO Disk Image | 4.2 |
| .CSO | Compiled Shader Object File | 4.1 |
| .CSP | Caché Server Page | 3.7 |
| .CSPROJ | Visual Studio C# Project | 3.9 |
| .CSR | Certificate Signing Request File | 3.6 |
| .CSS | Cascading Style Sheet | 4.0 |
| .CST | Manga Studio Story File | 4.1 |
| .CST | Director External Cast File | 3.5 |
| .CST | ContentServ Template | 2.7 |
| .CSV | Comma-Separated Values File | 3.3 |
| .CSX | Visual C# Script | 3.7 |
| .CSY | Canvas Symbol File | 3.7 |
| .CT | Cheat Engine Cheat Table | 4.1 |
| .CT | Scitex Continuous Tone Image | 4.0 |
| .CTB | AutoCAD Color-Based Plot Style File | 3.7 |
| .CTB | Chitubox Sliced 3D Model | 4.0 |
| .CTBODYFITTING | CrazyTalk Animator Actor Fitting File | 2.7 |
| .CTF | AVG Update Control File | 2.2 |
| .CTF | WhereIsIt Catalog | 2.9 |
| .CTG | Canon Digital Camera Catalog | 3.5 |
| .CTL | Visual Basic UserControl Object File | 2.9 |
| .CTM | CrazyTalk Model File | 2.0 |
| .CTP | CakePHP Template | 3.8 |
| .CTP | CrazyTalk Project File | 3.2 |
| .CTPROJECT | Cartoon Animator Project File | 3.8 |
| .CTS | CrazyTalk Script File | 3.7 |
| .CTT | Messenger Contact List | 3.9 |
| .CTV | Citavi Project | 3.7 |
| .CTV3 | Citavi 3 Project File | 3.0 |
| .CTX | Valve ICE Encoded Script | 2.2 |
| .CTXT | BlueJ Context File | 3.3 |
| .CTY | SimCity City File | 3.0 |
| .CU | CUDA Source Code File | 3.7 |
| .CUB | Analysis Services Cube File | 3.9 |
| .CUB | ISIS Cube File | 3.2 |
| .CUBE | Gaussian Cube File | 3.8 |
| .CUE | Cue Sheet File | 3.8 |
| .CUI | Autodesk Custom Workspace File | 4.1 |
| .CUID2 | Baidu Device ID File | 3.8 |
| .CUIX | AutoCAD Custom User Interface File | 4.0 |
| .CUL | Windows Cursor Library | 4.0 |
| .CUR | Windows Cursor Image | 4.3 |
| .CURSOR | KDE Plasma Custom Cursor Specification | 3.3 |
| .CURSORFX | CursorFX Theme File | 3.9 |
| .CURXPTHEME | CursorXP Theme File | 3.6 |
| .CUSTOMTANK | Wee Tanks! Custom Tank | 4.3 |
| .CV5 | Canvas 5 Drawing File | 2.8 |
| .CVA | HP System Software Manager Information File | 3.7 |
| .CVA | Canvas Sequence Set | 2.6 |
| .CVD | Canvas X Drawing | 3.5 |
| .CVD | ClamAV Virus Definitions File | 3.2 |
| .CVD | Bitdefender Virus Definition File | 3.1 |
| .CVG | Calamus Vector Graphic File | 3.0 |
| .CVI | Canvas Image File | 3.0 |
| .CVN | CineVision Encoding Session | 3.2 |
| .CVR | Microsoft Crash Report File | 3.9 |
| .CVS | Canvas 3 Drawing File | 3.1 |
| .CVSRC | CVS Command File | 3.0 |
| .CVX | Canvas Drawing | 3.5 |
| .CVXCAD | Canvas X Pro Drawing | 3.0 |
| .CW | CardWorks Template | 2.7 |
| .CWB | Cakewalk Bundle | 4.0 |
| .CWC | Coding with Chrome JavaScript File | 3.0 |
| .CWK | ClarisWorks Document | 3.9 |
| .CWP | Cakewalk SONAR Project | 3.5 |
| .CWS | ChordWizard Song | 4.0 |
| .CWT | Cakewalk SONAR Template | 3.6 |
| .CWT | ChordWizard Template | 3.5 |
| .CWW | Crossword Weaver Puzzle File | 2.5 |
| .CXA | FMAT Listmode File | 3.0 |
| .CXARCHIVE | CrossOver Bottle Archive | 3.5 |
| .CXD | SimplePCI Data Document | 2.2 |
| .CXF | Picasa Collage File | 3.6 |
| .CXI | FMAT RAW Image | 2.4 |
| .CXI | Nintendo 3DS Executable Image | 3.7 |
| .CXP | CX-Programmer Project File | 3.8 |
| .CXR | FMAT Plate Results File | 3.0 |
| .CXX | C++ Source Code File | 3.5 |
| .CYI | Clustify Input File | 2.0 |
| .CYO | Clustify Output File | 4.0 |
| .CYP | Home Design Project | 4.0 |
| .CYP | Home Designer Pro Project File | 3.5 |
| .CYS | Cytoscape Session File | 4.0 |
| .CZD | CAD Zone Drawing | 3.6 |
| .CZI | Carl Zeiss Image Data File | 3.2 |
| .CZIP | ZipGenius CryptoZip File | 3.2 |
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