| C | C code |
| C | Site configuration for Secure Remote (CheckPoint VPN) |
| CA | Telnet Server Initial cache data file |
| CAB | Microsoft cabinet file (program files compressed for software distribution) |
| CAC | dBase IV Executable file |
| CAD | Softdesk Drafix Cad file |
| CAG | Catalog file (Microsoft Clip Gallery v. 2.x,3.x,4.x) |
| CAL | CALS Compressed Bitmap |
| CAL | SuperCalc 4/5 Spreadsheet |
| CAL | Calendar schedule+ data file (Microsoft) |
| CAM | Casio camera file |
| CAN | Navigator Fax |
| CAP | Ventura Publisher Caption |
| CAP | Compressed music file |
| CAP | Telix Session Capture file |
| CAR | AtHome assistant file |
| CAS | Comma-delimited ASCII file |
| CAT | Quicken IntelliCharge categorization file |
| CAT | dBase Catalogue file |
| CB | Microsoft clean boot file |
| CBC | CubiCalc Fuzzy Logic System file |
| CBI | Column binary file (used in IBM mainframe systems) |
| CBL | Cobol Source code |
| CBM | XLib Compiled Bitmap |
| CBT | Generic Computer based training file |
| CC | Visual dBASE custom class file |
| CC | C++ Source code |
| CCA | cc:mail archive file |
| CCB | Visual Basic Animated Button configuration file |
| CCC | Curtain Call Native bitmap graphic |
| CCE | Data file (Calendar Creator Plus) |
| CCF | Multimedia Viewer configuration file used in OS/2 |
| CCF | Symphony Communications Configuration file |
| CCH | Corel Chart |
| CCL | Intalk Communication Command Language |
| CCM | Lotus CC:Mail "box" file (for example, INBOX.CCM) |
| CCO | CyberChat data file |
| CCO | XBTX Graphics |
| CCT | Macromedia Director Shockwave cast file |
| CDA | CD Audio Track |
| CDB | Clipboard file |
| CDB | CardScan Database (CardScan) |
| CDB | TCU Turbo C Utilities Main database |
| CDB | Conceptual model backup file (PowerDesigner) |
| CDF | Netcdf Graphic file |
| CDF | Microsoft Channel Definition Format |
| CDFS | Compact Disk filing system (WindRiver) |
| CDI | Phillips Compact Disk Interactive file |
| CDK | Atari Calamus Document |
| CDM | Conceptual model file (PowerDesigner) |
| CDM | Visual dBASE custom data module |
| CDM | Conceptual data model file (PowerDesigner Data Architect) (Sybase) |
| CDR | Corel Draw Vector drawing file |
| CDR | Raw Audio-CD data file |
| CDT | Corel Draw template |
| CDT | CorelDraw Data file |
| CDX | Corel Draw compressed drawing |
| CDX | Microsoft's Visual FoxPro index |
| CE | The FarSide Computer Calendar Main CE file |
| CEG | Tempra Show Bitmap graphic |
| CEL | CIMFast Event Language file |
| CEL | AutoDesk Animator Cel Image |
| CER | Certificate file (MIME x-x509-ca-cert) |
| CF | Imake Configurtion file |
| CFB | Comptons Multimedia file |
| CFG | Configuration file |
| CFL | CorelFLOW Chart |
| CFM | ColdFusion template |
| CFM | Visual dBASE Windows customer form |
| CFM | Corel FontMaster file |
| CFN | Atari Calamus Font data file |
| CFO | TCU Turbo C Utilities C form object |
| CFP | The Complete Fax Portable fax file |
| CGA | Ventura Publisher Display font file |
| CGI | Common gateway interface script |
| CGM | Computer Graphic Metafile |
| CH | OS/2 configuration file |
| CH | Clipper 5 Header |
| CH3 | Harvard Graphics 3.0 Chart |
| CH4 | Charisma 4.0 Presentation |
| CHD | FontChameleon Font descriptor |
| CHF | pcAnywhere remote control file |
| CHI | ChiWriter Document |
| CHK | File fragments saved by Windows Disk Defragmenter or ScanDisk |
| CHK | WordPerfect for Windows Temporary file |
| CHL | Configuration History Log |
| CHM | Compiled HTML file |
| CHN | Ethnograph Data file |
| CHP | Ventura Publisher Chapter file |
| CHR | Character Sets (Font file) |
| CHT | ChartViewer file |
| CHT | Harvard Graphics vector file |
| CHT | ChartMaster dBase Interface file |
| CIF | CalTech Intermediate Graphic |
| CIF | Easy CD Creator image |
| CIF | pcAnywhere caller file |
| CIF | Converted image file (Ventura Publisher) |
| CIL | Clip Gallery download package file |
| CIM | Sim City 2000 file |
| CIM | Cimpack design drawing file (CIMEX) |
| CIN | OS/2 change control file that tracks changes to an INI file |
| CIR | Save-file command (SuperMax E-CAD) |
| CIX | TCU Turbo C Utilities Database Index |
| CKB | Borland C++ Keyboard mapping file |
| CK1 | iD/Apogee Commander Keen 1 data |
| CK2 | iD/Apogee Commander Keen 2 data |
| CK3 | iD/Apogee Commander Keen 3 data |
| CK4 | iD/Apogee Commander Keen 4 data |
| CK5 | iD/Apogee Commander Keen 5 data |
| CK6 | iD/Apogee Commander Keen 6 data |
| CL | Generic LISP Source code |
| CL3 | Layout file (Adaptec Easy CD Creator) |
| CLASS | Java class |
| CLG | Disk Catalog database |
| CLL | Cricket Software Clicker File |
| CLO | Cloe Image |
| CLP | Windows Clipboard |
| CLP | Quattro Pro Clip art |
| CLP | Clipper 5 Compiler Script |
| CLR | 1st Reader Binary color screen image |
| CLR | PhotStyler Color defintion |
| CLS | Visual Basic Class Module |
| CLS | C++ Class Definition |
| CM | Craftman Data |
| CMA | Database file in plain text format (APPLIX TM1) |
| CMD | Command file for Windows NT (similar to a DOS .BAT file), OS/2 |
| CMD | DOS CP/M command file |
| CMD | dBase-II program file |
| CMD | 1st Reader External Command Menu |
| CMF | Corel Metafile |
| CFM | Creative FM-Music |
| CMG | Chessmaster saved game |
| CMK | Card Shop Plus file |
| CMM | CEnvi Batch file |
| CMP | JPEG Bitmap |
| CMP | Address document |
| CMP | CorelDRAW 4.0 Postscript Printer Header |
| CMP | Route 66 Address Document |
| CMP | Microsoft Word for DOS User dictionary |
| CMR | MediaPlayer Movie |
| CMU | Raster image file (Stereo), (developed by Carnegie Mellon University) |
| CMV | Corel Move animation |
| CMX | Corel Presentation Exchange image |
| CMYK | Raw cyan, magenta, yellow, and black bytes file |
| CNC | CNC General Program data |
| CNF | Configuration file used by Telnet, Windows, and other applications with varying internal formats |
| CNM | Windows application menu options and setup file |
| CNQ | Compuworks Design Shop file |
| CNT | Windows (or other) system content files for the help index and other purposes |
| CNV | Word for Windows Data conversion support file |
| CNV | WordPerfect for Windows Temporary file |
| CNV | Conversion files (WS_FTP Pro) files that will be converted from (Example) "HTML-"HTM" for upload |
| COB | trueSpace 2 object |
| COB | COBOL Source code |
| COD | Microsoft C compiler output as displayable machine language/assembler with original C as comments |
| COD | FORTRAN Compiled code |
| COD | dBase Application Generator Template source file |
| COD | Video Text file |
| COL | AutoDesk Animator Color Palette |
| COL | Microsoft Multiplan Spreadsheet |
| COM | Command file (program) |
| CON | Simdir Configuration file |
| CP8 | CP8 256 Gray Scale image |
| CPD | Corel PrintOffice file (drawing) |
| CPD | Fax Cover document |
| CPD | Complaints Desk Script |
| CPE | Fax Cover document |
| CPF | The Complete Fax (Fax file) |
| CPH | Image file (Corel Print House) see CPO |
| CPI | Microsoft MS-DOS code page information |
| CPI | ColorLab Processed Image bitmap |
| CPJ | CeQuadrant CD Project |
| CPL | Control Panel Module |
| CPL | Compel Presentation |
| CPL | Corel color palette |
| CPO | Image file (Corel Print Office) |
| CPP | C++ Source code |
| CPP | CA-Cricket Presents presentation |
| CPR | Corel Presents presentation |
| CPS | Central Point PC Tools Backup |
| CPS | Coloured postscript |
| CPT | Corel Photo-Paint image |
| CPT | Macintosh Compressed Archive |
| CPT | dBase Encrypted Memo |
| CPT | CA-Cricket Presents Template |
| CPX | Corel Presentation Exchange compressed drawing |
| CPY | Data file (Copy Books) |
| CPZ | COMPOZ Music Text |
| CRC | Circular reference file (Pro/Engineer) |
| CRC | Check file (Win-SFV32) (Fantasia Software) |
| CRD | Microsoft Windows 3.x Cardfile |
| CRF | Zortech C++ cross-reference |
| CRH | Image file (Microsoft Golf) |
| CRP | Corel Presents run-time presentation |
| CRP | Visual dBASE custom report |
| CRP | dBase IV Encrypted database |
| CRS | WordPerfect 5.1 for Windows File Conversion resource |
| CRT | Certificate file |
| CRT | Oracle Terminal settings information |
| CRT | Crontab file) |
| CRU | CRUSH Compressed archive |
| CSA | Comma deliminated text |
| CSC | Corel script |
| CSG | Statistica/w Graph file |
| CSH | C shell script files (Hamilton Labs) |
| CSM | Borland C++ 4.5 Precompiled header |
| CSM | Script file (Kodak Dc265 Camera) |
| CSO | Customer service data and outcome file |
| CSP | PC Emcee On-Screen image |
| CSS | Stats+ Datafile |
| CSS | Statistica/w Datasheet |
| CSS | Cascading Style Sheet (MIME) |
| CST | Macromedia Director "Cast" (resource) file |
| CSV | Comma-separated values file |
| CSV | CompuShow Adjusted EGA/VGA Palette |
| CT | Scitex CT bitmap |
| CT | A graphic file associated with the Paint Shop Pro Graphic Editor |
| CTC | PC Installer Control |
| CTF | Symphony Character code translation |
| CTL | Used in general for files containing control information. FAXWorks uses it to keep information about each fax sent and received. |
| CTL | dBase IV Control |
| CTX | Visual Basic User control binary file |
| CTX | Pretty Good Privacy (PGP) Ciphertext file |
| CTX | Microsoft Online Course Text |
| CUE | Microsoft Cue Cards data |
| CUL | Cursor library file (IconForge) |
| CUR | Windows Cursor |
| CURSOR | Sun Microsystems Cursor |
| CUT | Dr Halo Bitmap |
| CV | Corel Versions archive |
| CV | Microsoft CodeView information screen |
| CVG | Image |
| CVS | Canvas drawing file |
| CWK | Claris Works data |
| CWS | Claris Works template |
| CXT | Macromedia Director protected (not editable) "Cast" (resource) file |
| CXX | C++ source code |
| C-- | Sphinx C-- Source code |
| C00 | Ventura Publisher Print file |
| C01 | Typhoon wave |
| C86 | Computer Innovation (C86) Source code |
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