File Extensions "C"

File Extensions

File extensions are often used to determine the program that created the file. While users can rename files and/or associate odd extensions with particular programs, the following are some fairly standard associations.

Please let me know if you have applications not listed here, please advise so I can add them to the list. 

You can click on the first letter of the extension to go to that group
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.C C Program File
.C00 Ventura Print File
.C01 Typhoon Wave File
.C86 C86 C Program
.CA7 Beta 44 Job File
.CAB Cabinet File (Microsoft installation archive)
.CAD Softdesk Drafix CAD File
.CAL SuperCalc Worksheet or Calendar File or CALS compressed bitmap
.CAM Casio Camera Graphic
.CAP Ventura Caption or Telix Session Capture or
Compressed Music File
.CAS Comma-delimited ASCII File
.CAT Catalog or Quicken IntelliCharge Categorization File
.CB MS Clean Boot File
.CBI IBM Mainframe Column Binary Formatted File
.CBL COBOL Program
.CBT Computer Based Training
.CC C++ Program File
.CCA CC:Mail File
.CCB Visual Basic Animated Button Configuration
.CCC Chat
.CCF OS/2 Multimedia Viewer Configuration File
.CCH Corel Chart
.CCM Lotus CC:Mail Mailbox
.CCO CyberChat Data File
.CCR Chat Room Shortcut
.CCT Macromedia Director Shockwave Cast
.CDA CD Audio Track
.CDB Turbo C Database
.CDC Chromeleon Driver Configuration Plugin
.CDD Chromeleon Device Driver
.CDF Comma Delimited Format or Cyberspace Description Format or
MS Channel Definition Format
.CDI Phillips Compact Disk Interactive Format
.CDR Corel Vector Graphic or Raw Audio-CD Data
.CDT Corel Draw Template
.CDX Compound Index or Corel Draw Compressed Drawing or
MS Visual Foxpro Index or Active Server Document
.CEG Continuous Edge Graphic
.CEL Autodesk Animator Graphic or CIMFast Event Language File
.CER Certificate File
.CEX The Currency Exchanger Rate File
.CFB Comptons Multimedia File
.CFG Configuration (various)
.CFL Corel Flow File
.CFM Corel FontMaster or Cold Fusion Template File
.CGA Ventura CGA Screen Characters
.CGI Common Gateway Interface Script
.CGM Computer Graphics Metafile
.CH Clipper Header or OS/2 Configuration File
.CH3 Harvard Chart
.CHI Chiwriter Document
.CHJ Help Composer Project
.CHL Chromeleon Channel Raw Data
.CHM Compiled HTML Help
.CHP Ventura Publisher Chapter
.CHR Character or Font File
.CHT Cheat Machine Data File or ChartViewer File or
Harvard Graphics Vector File
.CIF Ventura Chapter Information
.CIL Clip Gallery Download Package
.CIM Sim City 200 File
.CIN OS/2 Change Control File
.CIT Intergraph Scanned Image
.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
.CL4 Easy CD Creator Layout File
.CLL Crick Software Clicker File
.CLP Windows Clipboard or Picture
.CLR WinEdit Colorization Word List
.CLS Visual Basic Class Module
.CMB Chromeleon Backup Archive
.CMD OS/2, WinNT Command File or COS CP/M Command File or
dBase II Program File
.CMF Creative Music File or Corel Metafile
.CML Cheat Machine Library File (Windows) or PADGen Company Info File
.CMP Leadview Bitmap or Open Access File or Address Document
.CMV Corel Move Animation
.CMX Corel PhotoPaint Image or Corel Presentation Exchange Image or
Apple Viewer File
.CNF Configuration (various) or SpeedDial
.CNM Windows Application Menu Options and Setup File
.CNQ Compuworks Design Shop File
.CNT Help File Contents (and other contents needs)
.CNV Data Conversion File or WP Temporary File
.COB COBOL Program File or Caligari Truespace Format or
TrueSpace2 Object
.COD Code List or Compiler Program Code
.COD Multiplan Data File or dBase Template Source File
.COL Autodesk Color Palette or Multiplan Spreadsheet or
Lotus Notes Import Column Description File
.COM Command (Executable file)
.CON Knowledgeware Consolidation File
.CPD Fax Coversheet or Corel PrintOffice File
.CPE Fax Coversheet
.CPI Code Page Information or ColorLab Image
.CPL Control Panel Extension or Corel Color Palette
.CPO Corel Print House File
.CPP C++ Program
.CPR Corel Presents Presentation or Knowledge Access Graphics
.CPS Antivirus Checksum File
.CPT Macintosh Compressed File or Corel Photo-Paint Image
.CPX Control Panel Applet or CryptaPix Encrypted Image or
Corel Presentation Exchange Compressed Drawing
.CRD Cardfile
.CRF Zortech C++ Cross-Reference File
.CRL Certificate Revocation List
.CRP Database or Corel Presents Run-Time Presentation
.CRT Certificate File
.CRY Crypto Chat II Encrypted Notebook-content
.CSC Corel Script
.CSD Bitstream Fontware File or Chemsoft® MSDS Database File
.CSK Claris Works
.CSM Borland C++ Symbol File
.CSP PC Emcee On-Screen Image
.CSQ Foxpro Queries
.CSS Hypertext Cascading Style Sheet
.CST Macromedia Director Cast File
.CSV Comma-Separated Variables
.CT Scitex CT Bitmap
.CTF TIFF Compressed File or
Symphony Character Code Translation
.CTL Setup Information or User Control
.CTX Compressed Text or User Control Binary File
.CTY SimCity City File
.CUE MS Cue Cards Data
.CUF Turbo C Utilities Form Definition
.CUL IconForge Cursor Library
.CUR Cursor
.CUT Dr. Halo Bitmap Graphic
.CV Corel Versions Archive or MS CodeView Information
.CV4 Codeview Colors
.CVP WinFax Cover Page
.CVT dBase Converted Database
.CVW Codeview Colors
.CWE Crossword Express
.CWK Claris Works Data
.CWS Claris Works Template
.CXT Macromedia Director Protected Cast File
.CXX Zortech C++ Program