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File Extension Database
Below is a listing of commonly used file extensions and their descriptions. This often helps find out what a file might be, and how to use the file.
ace - ACE Archiver compression file
aif - Audio Interchange File used with SGI and Macintosh applications
ani - Animated cursors used in Microsoft Windows
api - Application Program Interface
art - Clipart
asc - ASCII text file
asm - Assembler code
asp - Microsoft Active Server Page
avi - Audio-Video Interleaved used for Windows based movies
bak - Backup Files
bas - BASIC programming language sourcecode
bat - MS-DOS batch file
bfc - Briefcase document used in Windows
bin - Binary file
bin - MacBinary-encoded files
bmp - Bitmap format
bud - Backup disk for quicken by intuit
bz2 - Bzip2-compressed files
c - C source file
cat - Security Catalog file
cbl - Cobol code
cbt - Computer Based Training
cda - Compact Disc Audio track
cdt - Corel Draw Template
cfml - ColdFusion Markup Language
cgi - Common Gateway Interface. Web based programs and scripts
chm - Compiled HTML help files used by Windows
class - Javascript Class file
clp - Windows clipboard file
cmd - DOS Command file
cmf - Corel Metafile
com - Command file
cpl - Control panel item - The settings in Control Panels represent cpl files in the WondowsSystem folder
cpp - C++ programming language source code
css - Cascading Style Sheet. Creates a common style reference for a set of web pages
csv - Comma Separated Values format
cur - Cursor in Microsoft Windows
dao - Registry backup file for Windows registry
dat - Data file
dd - Compressed archive by Macintosh DiskDoubler
deb - Debian packages
dev - Device driver
dic - Dictionary file
dir - Macromedia director file
dll - Dynamic linked library. Microsoft application file
doc - Document format for Word Perfect and Microsoft Word
dot - Microsoft Word template
drv - Device driver
ds - TWAIN data source file
dun - Dial-up networking configuration
dwg - Autocad drawing
dxf - Autocad drawing exchange format
emf - Enhanced Windows metafile
eml - Microsoft Outlook eMail file
eps - Encapsulated PostScript supported by most graphics programs
eps2 - Adobe PostScript level II encapsulated PostScript
exe - DOS based executable file
ffl - Microsoft fast find file
ffo - Microsoft fast find file
fla - Macromedia Flash movie format
fnt - Font file
gid - Windows global index. Contains the index information used by help in Windows
gif - Graphics interchange file format. Supports animation. Created by CompuServe.
grp - Microsoft program manager group
gz - Unix compressed file
hex - Macintosh binary hex (binhex) file
hlp - Standard help file
hqx - Macintosh binary hex (binhex) file
ht - HyperTerminal file
htm - Hyper text markup. Markup language used for web design
html - Hyper text markup language. Markup language used for web design
icl - Icon library file
icm - Image color matching profile
ico - Microsoft icon image
inf - Information file used in Windows
ini - Initialization file used in Windows
jar - Java archive. A compressed java file format.
jpeg - Compression scheme supported by most graphics programs
jpg - 3 letter extension for jpeg. Compression scheme supported by most graphics programs
js - JavaScript file. Text file containing JavaScript program code
lab - Microsoft Excel mailing labels
lgo - Microsoft 9x startup logo
lit - eBooks in Microsoft Reader format
lnk - Windows 9x shortcut file
log - Application log file
lsp - Autocad (visual) lisp program
m3u - MPEG location file. Text file containing URL directions for MP3 files
maq - Microsoft Access query
mar - Microsoft Access report
mdb - Microsoft Access database
mdl - Rose model file. Opens with Visual Modeler or Rational Rose.
mid - MIDI data file
mod - Microsoft Windows 9x kernel module
mov - Quicktime movie
mp3 - MPEG audio layer 3
MPEG - Motion Pictures Expert Group compressed file
mpp - Microsoft Project file
msg - Microsoft Outlook message file
msg - Fidonet messages
ncf - Netware command file
nlm - Netware loadable module
o - Object file, used by linkers
ocx - ActiveX control: A component of the Windows environment
ogg - Ogg Virbis digitally encoded music file
ost - Microsoft Exchange/Outlook offline file
pak - WAD file that contains information about levels, settings, maps, etc for Quake and Doom
pcl - Printer control language file. PCL is a page description language developed by HP
pct - Macintosh drawing format
pdf - Printer desciption file. Provides printer support for certain applications
pdf - Portable document file by Adobe
pdr - Port driver for Windows 95. It is actually a virtual device driver (vxd)
php - Page containing PHP(Perl Hypertext Preprocessor) script
php3 - File containing PHP script. Most likely PHP version 3
phtml - Page containing PHP(Perl Hypertext Preprocessor) script
pif - Program information file
pif - Macintosh compressed archive
pif - Vector graphics GDF file (IBM Mainframe)
pl - Perl source code file
pm - Perl module
PM3 - PageMaker 3.0 document.
PM4 - PageMaker 4.0 document.
PM5 - PageMaker 5.0 document.
PM6 - PageMaker 6.0 document.
PNG - Portable Network Graphic file.
POL - System Policy file for Windows NT.
POT - Microsoft PowerPoint design template.
PPD - PostScript Printer descripion file used in Macintosh and Windows operating systems to provide printer specific features to a driver.
PPS - Microsoft PowerPoint slide show.
PPT - Microsoft PowerPoint presentation(default extension).
PRN - A print file created as the result of "printing to file".
PS - PostScript file.
PSD - Native Adobe Photoshop format.
PSP - Paint Shop Pro image.
PST - Personal Folder File for Microsoft Outlook.
PUB - Microsoft Publisher document.
PWL - Windows Password list file.
QIF - Quicken Import file.
RAM - RealAudio Metafile.
RAR - RAR compressed archive created by Eugene Roshall.
RAW - Raw File Format.
RDO - Raster Document Object. Proprietary file type used on Xerox, Digipath Scan and Makeready workstations.
REG - Registry file that contains registry settings.
RM - RealAudio video file.
RPM - RedHat Package Manager.
RSC - Standard resource file.
RTF - Rich Text Format.
SCR - Screen Saver file.
SEA - Self-extracting archive for Macintosh Stuffit files.
SGML - Standard Generalized Markup Language.
SH - Unix shell script.
SHTML - HTML file that supports Server Side Includes(SSI).
SIT - Compressed Macintosh Stuffit files.
SMD - SEGA mega drive ROM file.
SVG - Adobe scalable vector graphics file.
SWF - Shockwave Flash file by Macromedia.
SWP - DOS swap file.
SYS - Windows system file used for hardware configuration or drivers.
TAR - Unix Tape Archive.
TGA - Targa bitmap.
TIFF - Tagged Image File Format. Universal graphics format supported by most graphics applications.
TMP - Windows temporary file.
TTF - True Type font.
TXT - Text Format.
UDF - Uniqueness Definition File. Used for Windows unattended installations.
UUE - UU-encoded file.
VBX - Microsoft Visual basic extension.
VM - Virtual Memory file.
VXD - Windows 9x virtual device driver.
WAV - Waveform sound file.
WMF - Windows Metafile (graphics format).
WRI - Write Document: This is equivalent to RTF, Rich Text Format, that enables saving text with formatting information.
WSZ - Winamp Skin.
XCF - The GIMP's native image format.
XIF - Image file eXtended by ScanSoft is similar to TIFF and is a Pagis application format.
XIF - Xerox Image file (same as TIFF).
XIF - Wang imaging file. Wang Image Viewer comes with Windows 95/2000.
XLS - Microsoft Excel Spreadsheet.
XLT - Microsoft Excel Template.
XML - Extensible markup language.
XSL - XML style sheet.
ZIP - Compressed Zip archive.
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