C01 Typhoon wave files
CAB Microsoft cabinet file (program files compressed for software distribution)
CAD used by the drafting program "Drafix Cad">by Softdesk
CAL CALS Compressed Bitmap
CAL Calendar schedule data
CAM Casio camera format
CAP Compressed music file format
CAS Comma-delimited ASCII file
CAT IntelliCharge categorization file used by Quicken
CB Microsoft clean boot file
CBI Column binary formatted file (used in IBM mainframe systems)
CC Visual dBASE custom class file
CCA cc:mail file
CCB Visual Basic Animated Button configuration
CCF Multimedia Viewer configuration file used in OS/2
CCH Corel Chart
CCM Lotus CC:Mail "box" (for example, INBOX.CCM)
CCO CyberChat data file
CCT Macromedia Director Shockwave cast
CDA CD Audio Track
CDF Microsoft Channel Definition Format file
CDI Phillips Compact Disk Interactive format
CDM Visual dBASE custom data module file
CDR Corel Draw drawing
CDR Raw Audio-CD data
CDT Corel Draw template
CDX Corel Draw compressed drawing
CDX Microsoft's Visual FoxPro index
CEL CIMFast Event Language file
CER Certificate file (MIME x-x509-ca-cert)
CFB Comptons Multimedia file
CFG Configuration file
CFM ColdFusion template files
CFM Visual dBASE Windows customer form
CGI Common gateway interface script file
CGM Computer Graphics Metafile
CH OS/2 configuration file
CHK File fragments saved by Windows Disk Defragmenter or ScanDisk
CHM Compiled HTML file
CHR Character Sets (Font files)
CHP Ventura Publisher chapter
CHT ChartViewer file
CHT Harvard Graphics vector file
CIL Clip Gallery download package
CIM Sim City 200 file
CIN OS/2 change control file that tracks changes to an INI file
CK1 iD/Apogee Commander Keen 1 data file
CK2 iD/Apogee Commander Keen 2 data file
CK3 iD/Apogee Commander Keen 3 data file
CK4 iD/Apogee Commander Keen 4 data file
CK5 iD/Apogee Commander Keen 5 data file
CK6 iD/Apogee Commander Keen 6 data file
CLASS Java class
CLL Crick Software Clicker File
CLP Windows Clipboard file
CLS Visual Basic Class Module
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
CMF Corel Metafile
CMG Chessmaster saved game
CMP JPEG bitmap
CMP Address document
CMV Corel Move animation
CMX Corel Presentation Exchange image
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
COB trueSpace2 object
COD Microsoft C compiler output as displayable machine language/assembler with original C as comments
COM Command file (program)
CPD Corel PrintOffice file (drawing)
CPD Fax Cover document
CPE Fax Cover document
CPI Microsoft MS-DOS code page information file
CPL Control Panel extension
CPL Corel color palette
CPO Corel Print House file
CPP C++ code
CPR Corel Presents presentation
CPT Corel Photo-Paint image
CPX Corel Presentation Exchange compressed drawing
CRD Cardfile file
CRP Corel Presents run-time presentation
CRP Visual dBASE custom report file
CRT Certificate file
CSC Corel script
CSP PC Emcee On-Screen image
CSS Cascading Style Sheet file (MIME)
CST Macromedia Director "Cast" (resource) file
CSV Comma-separated values file
CT Scitex CT Bitmap
CT A graphic file associated with the Paint Shop Pro Graphic Editor
CTL Used in general to mean a file containing control information. FAXWorks uses it to keep information about each fax sent and received.
CUE Microsoft Cue Cards data
CUR Windows Cursor
CUT Dr Halo bitmap
CV Corel Versions archive
CV Microsoft CodeView information screen
CWK Claris Works data file
CWS Claris Works template
CXT Macromedia Director protected (not editable) "Cast" (resource) file
CXX C++ source code file