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
|
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
|
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
|
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
|
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
|
CFG
|
Configuration file
|
|
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 BluRay
|
Media hardware / software with BluRay structure support
|
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++
|
