#_C_EXTENSIONS

.C    C programming language source code file.
.C++  C++ programming language source code file.
.C2D  WinOnCD image file (Power Software's Free Any Burn).
.C2K  Card 2000 index card file (AS-Pro Software Card 2000).
.C2KJ Card 2000 Java applet file (AS-Pro Software Card 2000).
.C32  Card 32 index card file (AS-Pro Software Card 2000).
.C3D  Cool 3D projects file (ULEAD Cool 3D/VisualStudio and other Ulead products).
.C5F  Cameleon 5000 Formant Filter file (Camel Audio's Cameleon 5000 1.2).
.C5H  Cameleon 5000 Harmonics preset file (Camel Audio's Cameleon 5000 1.2).
.C5I  Cameleon 5000 Initialization/Reset file (Camel Audio's Cameleon 5000 1.2).
.C5I  Cameleon 5000 Instrument file (Camel Audio's Cameleon 5000 1.2).
.C5M  Cameleon 5000 Morph Envelope file (Camel Audio Cameleon 5000 1.2).
.C5N  Cameleon 5000 Noise preset file (Camel Audio Cameleon 5000 1.2).
.C5V  Cameleon 5000 Voice program file (Camel Audio's Cameleon 5000 1.2).
.C64  Commodore 64 emulator freeze/saved-state file (CCS64).
.C64  Commodore 64 graphical image file. Given how many formats are unique to the Commodore 64, the file is likely to be one of the more popular types such as Doodle, Koala, etc. (Many applications, many formats).
.C64  Commodore 64 image file (Andreas R Kleinert's SView5).
.C64  Commodore 64 program file (Many Commodore 64 emulator applications).
.C64  Commodore 64 SID chip audio file (SIDplay).
.C64  Documentation specific to the Commodore 64 operating system, Commodore 64 programs or programming, etc.
.CA   Composite Application file (IBM Lotus Symphony).
.CAB  Cabinet archive format file (Microsoft Windows and other archive applications, many variants).
.CAC  Cache file (many applications).
.CACHE Cache file (Ari Pikivirta's Home FTP Server).
.CACHE Cache file (many applications).
.CAF  Core Audio File (QuickTime and Soundtrack Pro and other audio applications).
.CAL  Calculator/spreadsheet save (Quantoid's Calc2).
.CAL  Calendar document file (Sierra On-Line's Print Artist 3).
.CAL  Calendar project file (MindScape PrintMaster Gold).
.CAL  CALS Group 4 black and white image file.
.CAL  Compressed bitmap image file.
.CAM  Camera image file (Casio cameras).
.CAR  Car/Cars data file = XCD car description format (MSB's Car Explorer).
.CAR  Quarter-fold Card project file (MindScape PrintMaster).
.CAS  Cassette tape image file = WAV/waveform audio content created by/for Radio Shack DOS/CoCo computer emulators (Nicola Salmoria & MAME team's Multiple Arcade Machine Emulator).
.CAT  Catalog file (Ashton Tate's dBase IV and other dBase and compatible database applications/developer environments).
.CAT  Security Catalog file (Microsoft Windows).
.CB   Chat room activity/conversation log file. Whether the extension was derived from the Citizen's Band radio or not, the use would be apt in this instance given CB radio communication's similarity with chat room/IRC chat activity.
.CBA  Compiled BASIC program.
.CBD  ContactBook Database file = text based (TEngel's ContactBook).
.CBL  Common Business Oriented Language/COBOL programming language source code file.
.CBM  Commodore Business Machines emulation file or emulated Commodore DOS disk image file (Style DirMaster and other Commodore computer emulators/applications).
.CBR  Captured Brush file (Boris Eyrich Software Artweaver).
.CBR  Comic Book RAR archive file (eBook applications).
.CBT  Comic Book TAR archive file (eBook applications).
.CBZ  Comic Book ZIP archive file (eBook applications).
.CC   CAMCAD document file (Many CAD/CAM applications).
.CCC  CorelCENTRAL Calendar File (Corel WordPerfect 8 Suite).
.CCD  CloneCD control file (Elaborate Bytes' CloneCD).
.CCF  Content Channel File (Go!Zilla 3.x download manager).
.CCF  CorelCENTRAL Card File (Corel WordPerfect 8 Suite).
.CCL  Credit Card Logfile (Retro Software Designs Credit Card Verifier).
.CCP  CloneCD Profile file (SlySoft's CloneCD).
.CCP  CorelCENTRAL Planner file (Corel WordPerfect 8 Suite).
.CCT  CAM Card Template file (CAM Development Business Card Designer Plus).
.CDA  Compact Disc Audio track file (Many applications and devices).
.CDA  Compact Disk digital audio.
.CDAPP Plug-in file (Safer-Networking's SpyBot Search & Destroy).
.CDC  Compact Disc jewel case Cover project file (Nero Burning ROM/Nero Express).
.CDC3 Cartes Du Ciel 3 file (Patrick Shevalley's Cartes du Ciel 3/Sky Charts 3).
.CDD  ConceptDraw Document (CS Odessa's ConceptDraw).
.CDDA AIFF audio (QuickTime 7.7.2).
.CDDA Compact Disc Digital Audio track file (Many applications).
.CDE  CD Exchange data entries file (CD Storage Master).
.CDG  Karaoke file = the video file portion that requires an audio file to accompany/play with it.
.CDI  DiscJuggler CD Image file (Power Software's Free Any Burn).
.CDJ  DiscJuggler 6 disk image file (Padus' DiscJuggler 6).
.CDL  CADL section entities file (CadKey and other CAD/CAM applications).
.CDL  ConceptDraw Library file (CS Odessa's ConceptDraw).
.CDLX CD Layout file (Adobe Audition).
.CDR  CorelDRAW vector format image file (CorelDRAW and many other graphics applications).
.CDS  C-Organizer Database file (CSoftLab C-Organizer 2001).
.CDS  Cadrans Solaires fichiers = Sundial file (Francois Blateyron's Shadows).
.CDS  Native CD catalog Storage database file (CD Storage Master).
.CDT  ConceptDraw Template file (CS Odessa's ConceptDraw).
.CDT  CorelDRAW Template image file (CorelDRAW, CorelDesigner).
.CDW  ConceptDraw Workspace file (CS Odessa's ConceptDraw).
.CDX  Compound Index file (Microsoft Visual FoxPro 6).
.CDX  CorelDRAW Compressed image file (Corel's CorelDRAW).
.CEDCOVERS Cover Editor Designer Covers file (Ashampoo Burning Studio).
.CEDPRJ Cover Editor Designer Project file (Ashampoo Burning Studio).
.CEDTHEME Cover Editor Theme file (Ashampoo Burning Studio 11).
.CEL  Celestia script (3 dimensional celestial emulation application).
.CEL  Cool Edit audio Loop file (Cool Edit Pro).
.CEL  FLC animation (QuickTime 7.7.2).
.CEL  Flic animation Cel format image (Autodesk Animator and other image applications).
.CER  Certificate document file (Sierra On-Line's Print Artist 3).
.CER  Certificate project file (MindScape PrintMaster).
.CER  Security Certificate file (Microsoft Windows cryptographic tasks).
.CFG  Application skin file (Draw3D).
.CFG  Hardware Configuration file (Many applications).
.CFG  Instructional documentation for configuring applications/devices = Text files (Software distributions).
.CFG  Program Configuration file (Many applications).
.CFM  Cold Fusion Markup Language file (ColdFusion and other webmastering applications).
.CFML Cold Fusion Markup Language file (ColdFusion and other webmastering applications).
.CFP  CD-RTools Front-End Project file (O. Valencia's CDRTools Front-End/CDRTFE).
.CFS  CFScript snippet file (Allaire ColdFusion).
.CGA  Ulead CG Animation library file (Ulead CG Infinity).
.CGE  Ulead CG Envelope library file (Ulead CG Infinity).
.CGI  Common Gateway Interface file = Perl language script (Many applications).
.CGM  Computer Graphics Metafile format image file (Many graphics applications).
.CGO  Ulead CG Object file (Ulead CG Infinity).
.CGO  Ulead CG Style library file (Ulead CG Infinity).
.CGP  Captor Group file (StileSoft NetCaptor 6.5).
.CGZ  Compressed CGM image file (Many graphics applications).
.CH3  Harvard Graphics format image.
.CHA  Change sets file (Cincom VisualWorks SmallTalk).
.CHA  Character file.
.CHA  Color Channel mixture adjustment file (Adobe Photoshop).
.CHI  ChimpNotes file (Demios' Chimp Notes).
.CHIMPNOTES ChimpNotes file (Demios' Chimp Notes).
.CHL  Chain Launching jobs file (Greatis' RegRun Security Suite 3).
.CHM  Compiled HTML format help file (Many applications).
.CHP  ChimpNotes v1 file (Demios' Chimp Notes).
.CHR  Bitmap Character set = single image containing a monospaced character set (Many applications, games in particular. Many variants).
.CHR  Character set file (Borland C++ applications).
.CIF  CD Image File (Adaptec Easy CD Creator 3).
.CIF  Easy CD/DVD Creator Image File (Power Software's Free Any Burn).
.CIN  Channel Information file (GTek).
.CIN  Kodak Cineon format image file (CinePaint and other graphics/animation applications).
.CIR  SPICE Circuit/schematic file.
.CIRC Ciruit project file (Logsim).
.CIT  Citation/Citations file (Many applications).
.CIT  CITI file.
.CITI CITI circuit file.
.CIX  Code Intelligence XML file (ActiveState's Komodo Edit).
.CL   Class file.
.CL   Cursor Library file (Aha-Soft's IconUtils ArtCursors).
.CL   Lisp source code file.
.CL3  CD Layout file (Adaptec Easy CD Creator 3).
.CLA  Class file (Cincom VisualWorks SmallTalk).
.CLASS Java Class file (Many Java applications).
.CLB  Color Book file (QuarkXPress Passport).
.CLG  Catalog file of WIM file (Windows System Image Manager).
.CLISP Lisp source code file.
.CLJ  Clojure source file.
.CLK  Image file (Corel R.A.V.E.).
.CLONEDVD CloneDVD 2 project file (Elaborate Bytes' CloneDVD 2).
.CLP  Clipboard clipping = Saved clipboard objects (Windows ClipBook Viewer and other applications).
.CLR  Color settings file (MindScape PrintMaster).
.CLS  Classlist description file (Microsoft's series of Flight Simulator games - many variants).
.CLV  ClearVideo video file.
.CMAKE CMake project file.
.CMB  Combat Mission game-save/scenario Battle file (Big Time Software's Combat Mission).
.CMD  FastLynx 2 form file = command script (Sewell Development's FastLynx 2/3).
.CMD  Command/CMD.exe batch file = Batch/BAT file. The only difference between CMD and BAT is the extension and that Windows NT variants do not have access to a real MS-DOS (NT-based Windows operating systems).
.CMIS Page Critic Mission file (FirstPlace Software's WebPosition Gold).
.CMO  CyberMotion 3D object project file (CyberMotion 3D-Designer 6).
.CMP  Lead CMP image file = Lead JPEG (Graphics editors/applications).
.CMX  Corel Metafile Exchange file.
.CMX  Corel Presentations Exchange format file (Corel Word Perfect Office X6).
.CNF  Conferencing speed-dial shortcut file (Microsoft Windows).
.CNO  Conference file (CIX's Ameol2).
.CNT  Contents file for Windows HLP document (Microsoft Windows Help).
.COB  Caligari trueSpace 3D Object file (Caligari Truespace, Bryce, and other 3D editors/viewers).
.COL  Collection file (Invention Pilot's Silver Pilot).
.COLLECTION Collection file = Text or binary (Paul Boersma's and David Weenink's Praat linguistics research software).
.COLOR Color gradient file (Neuber Font Twister).
.COM  COM application file (Windows operating system).
.COMPOSITEFONT Composite Font file (Corel Word Perfect Office X6).
.CONF Configuration file (Many operating systems, applications and variants).
.CONFIG Confuguration file (Many applications and variants).
.CPG  Calypso Plug-in file (Micro Computer Systems' Calypso e-mail client).
.CPIO CPIO format archive container file (Many applications).
.CPK  Copernic engine Package file (Copernic 2000).
.CPL  Control Panel object file (Microsoft Windows).
.CPN  Campaign file (Microsoft's Age of Empires 2).
.CPP  C++ and C# programming source code file (Many C++ and C# development environments and compilers).
.CPSH Color Pixel Shader file (Ashampoo Burning Studio).
.CPT  Corel PHOTO-PAINT 6 & 7 bitmap image file (Corel PHOTO-PAINT, CorelDRAW X6, and other graphics applications).
.CPX  Corel ArtShow image file (Corel ArtShow).
.CR2  Canon RAW v2 format image file.
.CRD  Card file (Microsoft Windows 3.x/9x/ME).
.CRD  Contact events markup (ICQ2000a).
.CRF  CDCheck diagnostic, reliability, error Report File (CDCheck). CDCheck developer began employing this extension and ceased using .CDF when it was discovered other products used the .CDF extension.
.CRF  Crafts document file (Sierra On-Line's Print Artist 3).
.CRL  Certificate Revocation List file (Many applications/operating systems).
.CRL  Certificate Revocation List file (Microsoft Windows).
.CRON Crontab file (ActiveState's Komodo Edit).
.CRP  Crop files (SimFarm game).
.CRT  Commodore 64 auto-starting Cartridge ROM or utility Cartridge (Most good C64 emulators).
.CRT  Crate file (Allaphs' CrateSim).
.CRW  Canon RAW format image file.
.CRX  Chrome Extension file (Axure RP Pro).
.CS   C# code/script file (sharpdevelop.net's JSharp Develop 4).
.CS   C# programming language source code (Microsoft VisualStudio).
.CS0  Calendarscope planner/scheduler data file (Duality Calendarscope).
.CSD  CSound orchestra file (Algorithmic composition applications that employ the CSoundAC API, CSoundQt).
.CSD  CSound score file (Algorithmic composition applications that employ the CSoundAC API, CSoundQt).
.CSF  IGC Content Sealed Format file = Proprietary encrypted redactable CAD/document delivery format (IGC's Brava Desktop and Brava/Free DWG Viewer).
.CSH  C Shell script file (Many Unix/Linux operating systems, Bill Joy's C shell command line interface).
.CSH  Custom Shape file (Adobe Photo Elements).
.CSK  Copernic Skin file (Copernic 2000).
.CSL  Corel Symbol Library file (CorelDRAW X6 and other Corel products).
.CSM  Cartography Shop Map file (Cartography Shop).
.CSM  CShop Map file (Leadwerks 3D World Studio).
.CSO  CSound orchestra file (Algorithmic composition applications that employ the CSoundAC API, CSoundQt).
.CSPROJ C# Project file (sharpdevelop.net's JSharp Develop 4).
.CSPROJ C++ Source code Project file (Microsoft VisualStudio).
.CSQ  Client-Server Query Wizard file = SQL Query for OBDC databases (Microsoft's Visual FoxPro 2.6).
.CSS  Cascading Style Sheet markup/code file (Many document applications, especially web document/development applications).
.CST  Crosti cross-stitch Scheme Template file (Levin Sergey's Crosti).
.CSV  Comma Separated Values file = data sharing/verification file format (Many applications).
.CSV  Comma Separated Values spreadsheet file (Draw3D).
.CSZ  Skin ZIP archive file (TCMP).
.CT   SciTex Continuous Tone image file (Many graphics applications).
.CT2  CreaToon 2 scene file (Androme CreaToon 2).
.CTB  CTB file (AutoDWG's PDF Converter).
.CTF  Catalog File (WhereIsIt?).
.CTG  Catalog Group file (WhereIsIt?).
.CTI  Completed Task list file (Pollen's Task-O-Matic).
.CTM  Catalog Template file (WhereIsIt?).
.CTX  CreaToon Extension file (Androme CreaToon 2).
.CTY  City file (Maxis' SimCity, SimCity for Windows).
.CUE  Cue sheet file (Many audio and other applications).
.CUE  Disc image (Many applications).
.CUE  Optical media image Cue file (Many applications).
.CUI  Color UI file (Quark's CopyDesk and other Quark products).
.CUJ  Clean-up Job file (Personal Backup).
.CUL  Cursor Library file (Cursor Arts' IconForge 6).
.CUR  Cursor file (Hagen Wieshofer's Icon Edit Pro).
.CUR  Static Cursor image file (Microsoft Windows and other icon/cursor applications).
.CUT  Dr. Halo image file (Many image applications).
.CUX  CUX image file (ACDSee).
.CVF  Compressed Volume File (Many applications).
.CVG  Calamus Vector Graphics file (Calamus).
.CVL  Convolution kernal settings file (Adobe Systems' Premiere and other Adobe Systems' products).
.CVR  Cover page file (ElectraSoft 32bit Fax 9).
.CVSH Color Vertex Shader file (Ashampoo Burning Studio).
.CW_  Corel Workspace file (Corel's CorelDRAW X6).
.CXF  QCad font file (LibreCAD).
.CXN  Conference file (CIX's Ameol2).
.CXT  Crayola file (IBM Crayola Print Factory).
.CXX  C++ programming language source code file.