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The most important file types used in Windows, Mac OS and Linux/ Unix, grouped by their extension's first letter.

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File types by extension - C

These are all file name extensions starting with letter C.


  • .c - C programming language source code
  • .c4d - Clonk object definition file
  • .c4f - Clonk scenario folder file
  • .c4p - Clonk player file
  • .c4m - Clonk material file
  • .c4i - Clonk object info file
  • .c4s - Clonk scenario file
  • .c4q - Clonk queue file
  • .c4v - Clonk video file
  • .cab - Cabinet compressed file
  • .cat - Security catalogue file
  • .cbl - Cobol source file
  • .cc - C++ source file
  • .ccd - CloneCD control file
    More on *.CCD files
  • .cda - Compact disk audio track
  • .cdt - Corel Draw template file
  • .cdx - Visual FoxPro compound index
  • .cfml - ColfFusion markup language file
  • .cfg - Delphi configuration file
  • .cgf - CargoMap file
  • .cgi - CGI web based program or script
  • .chm - Compiled HTML help file
  • .cif - Easy CD Creator CD image file
  • .class - Compiled Java class file
  • .clp - Windows clipboard file
  • .cmd - Windows-DOS command script file
  • .cmf - Corel Metafile
  • .cnt - Contents file for a windows help file
  • .com - Executable command file
  • .cpl - Control panel item file
  • .cpp - C++ language source file
  • .cpt - Compact Pro file
  • .cs - Visual C# source file
  • .css - Cascading style sheet file
  • .csv - Comma separated value file
  • .ctt - Messenger contacts file
  • .cue - Cue sheet file
  • .cur - Microsoft Windows cursor file
  • .cvs - CANVAS file
  • .cvx - CANVAS file
  • .cxx - C++ language source file


Generated 0:02:09 on Dec 15, 2017