C
| Ext. | Description | Used by |
|---|---|---|
| C-- | C—language source | Sphinx C-- |
| C | C language source Note that on case-sensitive platforms like Unix and with the gcc compiler the uppercase .C extension indicates a C++ source file. |
Watcom C/C++, Borland C/C++, gcc and other C compilers |
| C | Unix file archive | COMPACT |
| C++ | C++ language source | |
| C00 | Print file | Ventura Publisher |
| C01 | Typhoon wave files | AWAVE |
| C32 | COMBOOT Executable (32-bit) | SYSLINUX |
| C86 | C source code file | Computer Innovation C86 |
| CA | Initial cache data for root domain servers | Telnet |
| CA? | Borland packed and split file | Borland Installer |
| CAB | Win 95 packed file | Win 95 |
| CAC | dBASE IV executable when caching on/off (see cachedb.bat) | |
| CAD | Drawing | BobCAD-CAM |
| CAD | Document | Drafix Windows CAD |
| CAL | Calendar file | Windows 3.x |
| CAL | Spreadsheet format | SuperCalc |
| CALS | Computer Aided Acquisition and Logistics | |
| CALS | Support Raster Format | |
| CAM | Casio Camera | |
| CAN | Fax | Navigator Fax |
| CAP | Caption | Ventura Publisher |
| CAP | Capture file | ProComm - Telix |
| CAS | C + ASM language source | Turbo C |
| CAT | Catalog | CP Backup - dBASE IV |
| CAT | Device driver digital signature | Microsoft Windows |
| CAT | Stellarium Star Catalogue | Stellarium |
| CATDrawing | Drawing file of CATIA V5 | CATIA V5 |
| CATPart | Part file of CATIA V5 | CATIA V5 |
| CATProduct | Assembly file of CATIA V5 | CATIA V5 |
| CATS | Combined source | ATS |
| CBA | Source code | Creative BASIC |
| CBC | Fuzzy logic system | CubiCalc |
| CBL | COBOL source code file | |
| CBM | Compiled bitmap graphics | XLib |
| CBR | Comic Book Reader (RAR file) | CDisplay and similar |
| CBS | MasterWord button bar configuration file | |
| CBT | COMBOOT Executable (incompatible with DOS COM files) | SYSLINUX |
| CBT | Computer Based Training | many |
| CBZ | Comic Book Reader (ZIP file) | CDisplay and similar |
| CC | C++ source code file | |
| CC | CC language source | CC |
| CCC | Bitmap graphics (native format) | Curtain Call |
| CCF | Communications configuration file | Symphony |
| CCF | Color Chat file | Color Chat File |
| CCH | Chart | CorelChart |
| CCITT | CCITT Group 3 and Group 4 Encoding | |
| CCL | Communication Command Language file | Intalk |
| CCO | BTX Graphics file | XBTX |
| CCT | Print Template | BobCAD-CAM |
| CD | CD description | DN |
| CDA | CD-Audio | Win95 |
| CDB | Card database | CardScan |
| CDB | Main database | TCU Turbo C Utilities |
| CDF | Common Data Format | |
| CDF | Company Data File | Nominal Small Business Accounting software |
| CDF | Computable Document Format | Mathematica |
| CDF | Cyberspace Description Format | |
| CDF | Graphics | netcdf |
| CDK | Document | Atari Calamus |
| CDL | CADKey CADL Language | CADKey |
| CDM | Disk Drivers NPA | Novell NetWare |
| CDM | Music format (compressed) | |
| CDR | Vector graphics format (drawing) | CorelDraw! |
| CDT | Corel Draw Template File | CorelDraw! |
| CDX | Compound index file | Visual FoxPro, Advantage Database Server |
| CE | Computer Eyes | Conversion Artist |
| CE | Main.ce | The FarSide Computer Calendar |
| CEB | Cont. Edge Bitmap | Conversion Artist |
| CEF | CA-Clipper Workbench Application | CA Clipper |
| CEF | Export File | |
| CEF | Compact Embedded Font | Adobe Illustrator |
| CEG | Bitmap graphics | Tempra Show - Edsun Continuous Edge Graphics |
| CEL | Animation CEL | 3D Studio |
| CEL | Graphics | Autodesk Animator - Lumena |
| CF | Configuration file | imake |
| CFA | Audio file | Adobe Premiere Pro |
| CFC | ColdFusion Component | Adobe ColdFusion |
| CFG | Configuration file | |
| CFL | Chart | CorelFLOW |
| CFM | ColdFusion Markup Language | Adobe ColdFusion |
| CFN | Font data | Atari Calamus |
| CFO | C Form Object internal format object file | TCU Turbo C Utilities |
| CFP | Fax | The Complete Fax Portable |
| CFT | CFast graphics file | Disney Animation Studio |
| CGA | CGA display font | Ventura Publisher |
| CGI | Common Gateway Interface script | |
| CGM | Computer Graphics Metafile vector graphics | A&L - HG - many |
| CH | Clipper language header | CA Clipper |
| CH3 | Chart | Harvard Graphics 3.0 |
| CH4 | Presentation | Charisma 4.0 |
| CHD | Font descriptor | FontChameleon |
| CHI | ChiWriter Document | ChiWriter - Chiview |
| CHK | Recovered data | DOS CHKDSK |
| CHK | Temporary file | WordPerfect for Win |
| CHL | Configuration History Log | |
| CHM | Compiled Help File | Microsoft Windows, Help Explorer Viewer |
| CHML | Encrypted Data File | Krasbit Technologies, Chameleon Imaging Workflow Software |
| CHN | Data | Ethnograph 3 |
| CHP | Chapter file | Ventura Publisher |
| CHR | Character set | Turbo C - Turbo Pascal |
| CHT | Chart | Harvard Graphics 2.0 - SoftCraft Presenter |
| CHT | CHeaT in any program/game | many |
| CHT | Interface file for ChartMaster | dBASE |
| CHZ | Archive | CHARC |
| CIF | Caltech Intermediate Format graphics file | |
| CIF | Chapter information | Ventura Publisher |
| CIF | Crystallographic Information File | RasMol, Jmol |
| CiM | C Text Mode Image File | The Ultimate Draw |
| CIX | Database index | TCU Turbo C Utilities |
| CKB | Borland C++ 4.x editor keystroke mapping | BCW.EXE |
| CL | COMMON LISP source code file | |
| CLA | Source | Clarion |
| CLASS | Java class file | Java |
| CLD | Clipper debugger configuration file | CA Clipper |
| CLJ | Clojure source code | Clojure |
| CLP | Clip art graphics file | Quattro Pro |
| CLP | Clipboard file | Windows 3.x |
| CLP | Compiler response file | CA Clipper |
| CLP | Graphics format | PCPAINT/Pictor |
| CLPI | ClipAV Clip Information file for Blu-ray | Media hardware / software with Blu-ray structure support |
| CLPRJ | ClassicLadder project file | ClassicLadder |
| CLR | Color binary screen image | 1st Reader |
| CLR | Color definitions | Photostyler |
| CLR | Color scheme | Boxer/2 |
| CLR | Palette file for GIS format | |
| CLS | C++ class definition file | |
| CLW | MFC Class Wizard information | Microsoft VC++ |
| CM | Data file | CraftMan |
| CMB | Xtree for Windows Button Bar file | |
| CMD | Command | dBASE - Waffle |
| CMD | Command Prompt batch file | Microsoft Windows NT based operating systems |
| CMD | executable programs | CP/M-86 operating system |
| CMD | External command menu | 1st Reader |
| CMD | OS/2 batch/REXX file | OS/2 |
| CMF | FM-music file (Creative Music File) | |
| CMK | Card | Card Shop Plus |
| CMM | CMM script (batch) file | CEnvi |
| CMP | Bitmap graphics (Lead CMP compression) | |
| CMP | Compressed data | PKWare Inc. data compression library |
| CMP | Header file for PostScript printer files | CorelDRAW |
| CMP | Photofinish Calibration Map | Photofinish |
| CMP | User dictionary | Microsoft Word for DOS |
| CMRL | Concise message routing language | DOTGO |
| CMS | Content Management System | Any Web Browser |
| CMU | Carnegie Mellon University Formats | |
| CMV | Animation (CorelMove CorelDraw 4.0) | CorelMove CorelDraw 4.0 |
| CNC | CNC general program data | |
| CND | System generation conditional file | RT-11 |
| CNF | Configuration (program - printer setup) | program - printer setup |
| CNF | Configuration file | |
| CNV | Temporary file | WordPerfect for Win |
| CNV | Winword DLL used as part of an import operation (CNV=converter) | Microsoft Word |
| CO | Cobalt - parametric drafting and 3D modeling | Ashlar-Vellum |
| COB | Calgari trueSpace2 File Format | |
| COB | COBOL source code file | |
| COD | Code definition table | UUPC |
| COD | Datafile | Forecast Plus - Microsoft Multiplan - StatPac Gold |
| COD | file uncluding CODES for any program/game | many |
| COD | Printer code definition file | Boxer/2 |
| COD | Program compiled code | FORTRAN |
| COD | Template source file | dBASE Application Generator |
| COD | Videotext file | |
| COE | Coefficient file | Xilinx ISE |
| COF | Animation Control File | Diablo II |
| COL | Color palette | Autodesk Animator - many |
| COL | Spreadsheet | Microsoft Multiplan |
| COM | Command (memory image of executable program) | DOS |
| COM | Indirect command file (sequence of commands to be executed) | RT-11 |
| CON | Configuration file | Simdir |
| CON | MSTS Consist file | MSTS |
| CPC | Compressed image | Cartesian Perceptual Compression |
| CPD | Script | Complaints Desk |
| CPF | Fax | The Complete Fax |
| CPI | ColorLab Processed Image bitmapped graphics file | |
| CPI | MS-DOS codepage file | MODE.EXE |
| CPL | Control panel file | Windows 3.x |
| CPL | Presentation | Compel |
| CPMZ | ConPro/Miradi Zipfile | Miradi and ConPro |
| CPP | C++ language source | Watcom C/C++ |
| CPP | Presentation | CA-Cricket Presents |
| CPR | Knowledge Access | GCGW |
| CPS | backup of startup files by QEMM (?) autoexec.cps | |
| CPT | Encrypted memo file | dBASE |
| CPT | Mac file archive | COMPACT PRO |
| CPT | Template | CA-Cricket Presents |
| CPZ | Music text file | COMPOZ |
| CR2 | Raw image format | Canon digital cameras |
| CRA | Advanced crack file (usually text) | |
| CRD | Cardfile | Windows 3.x - YourWay |
| CRD | Map | Holux - Alan |
| CRD | Molecular coordinates | CHARMM, RasMol |
| CRDOWNLOAD | Google Chrome download in progress | Google Chrome |
| CRF | Cross-reference | Microsoft MASM - Zortech C++, RT-11 CREF |
| CRK | Crack file (usually text) | |
| CRP | Encrypted database | dBASE IV |
| CRS | File Conversion Resource | WordPerfect 5.1 |
| CRT | Terminal settings information | Oracle |
| CRU | Compressed file archive created by CRUSH | |
| CS | C# source file | C# |
| CSD | Compact Shared Document | Dream To Reality |
| CSG | Batch file (Submit) | ISIS/w |
| CSG | Graph | Statistica/w |
| CSM | Borland C++ 4.x precompiled header file | BCW.EXE |
| CSP | PC Emcee Screen Image file | Computer Support Corporation |
| CSS | Datafile | CSS - Stats+ |
| CSS | Datasheet | Statistica/w |
| CSS | cascading style sheet | |
| CSV | Adjusted EGA/VGA palette | CompuShow |
| CSV | Comma Separated Values text file format (ASCII) | |
| CTC | Control file | PC Installer |
| CTF | Character code translation file | Symphony |
| CTK | CommonTime Key file | CommonTime software applications |
| CTL | Control file | dBASE IV - Aldus Setup |
| CTL | BATCH control file (generated by BATCH from .BAT file) | RT-11 |
| CTT | BATCH Temporary file | RT-11 |
| CTX | Ciphertext file | Pretty Good Privacy RSA System |
| CTX | Course TeXt file | some Microsoft online guides |
| CTX | document | Creativyst Table eXchange |
| CUF | C Utilities Form definition | TCU Turbo C Utilities |
| CUR | Windows resource (cursor image file) | Resource Workshop - WRT - Watcom Resource Editor |
| CUT | Graphics format (bitmapped graphics) | dr. Halo |
| CV4 | Color file | CodeView |
| CVP | Cover page | WinFax |
| CVS | Graphics | Canvas |
| CVT | Backup file for CONVERTed database file | dBASE IV |
| CVW | Color file | CodeView |
| CWEB | C Web | |
| CWK | Datafile | ClarisWorks, Appleworks |
| CXX | C++ source code file | Zortech C++ |
| CYS | Cytoscape session file | Cytoscape |
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