The following is a list of the more common file suffixes. We have also included a common question section at the foot of the page, along with links that may be able to assist you in handling a particular file type..
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ACE
AIF
ANI
API
ART
ASC
ASM
ASP
AVI
BAK
BAS
BAT
BFC
BIN
BIN
BMP
BUD
BZ2
C
CAT
CBL
CBT
CDA
CDT
CFML
CGI
CHM
CLASS
CLP
CMD
COM
CPL
CPP
CSS
CSV
CMF
CUR
DAO
DAT
DD
DEB
DEV
DIC
DIR
DLL
DOC
DOT
DRV
DS
DUN
DWG
DXF
EMF
EML
EPS
EPS2
EXE
FFL
FFO
FLA
FNT
GIF

GID
GRP
GZ
HEX
HLP
HT
HQX
HTM
HTML
ICL
ICM
ICO
INF
INI
JAR
JPEG
JPG
JS
LAB
LGO
LIT
LNK
LOG
LSP
MAQ
MAR
MDB
MDL
MID
MOD
MOV
MP3
MPEG
MPP
MSG
MSG
NCF
NLM
O
OCX
OGG
OST
PAK
PCL
PCT
PDF
PDF
PDR
PHP
PHTML
PIF
PIF
PIF
PL
PM
PM3
PM4
PM5
PM6
PNG
POL
POT
PPD

PPS
PPT
PRN
PS
PSD
PSP
PST
PUB
PWL
QIF
RAM
RAR
RAW
RDO
REG
RM
RPM
RSC
RTF
SCR
SEA
SGML
SH
SHTML
SIT
SMD
SVG
SWF
SWP
SYS
TAR
TGA
TIFF
TMP
TTF
TXT
UDF
UUE
VBX
VM
VXD
WAV
WMF
WRI

WSZ
XCF
XIF
XIF
XIF
XLS
XLT
XML
XSL
ZIP

ACE Archiver compression file.
Audio Interchange File used with SGI and Macintosh applications.
Animated cursors used in Microsoft Windows.
Application Program Interface.
Clipart.
ASCII text file.
Assembler code.
Microsoft Active Server Page.
Audio/Video Interleaved used for Windows based movies.
Backup Files.
BASIC programming language source code
MS DOS batch file.
Briefcase document used in Windows.
Binary File.
MacBinary encoded files.
Bitmap format.
Backup Disk for Quicken by Intuit.
Bzip2 compressed files.
C program language source source file.
Security Catalog file.
COBOL program language source code file.
Computer Based Training.
Compact Disc Audio Track.
Corel Draw Template file.
ColdFusion Markup Language.
Common Gateway Interface. Web based programs and scripts.
Compiled HTML Help files used by Windows.
Javascript Class file.
Windows Clipboard file.
DOS Command File.
Command File.
Control panel item - CPL files in the Windows\System folder.
C++ programming language source code.
Cascading Style Sheet. Creates a common style reference for a set of web pages.
Comma Separated Values format.
Corel Metafile.
Cursor in Microsoft Windows.
Registry Backup file for Windows registry.
Data file. A vanilla extension, equivalent to not having an extension.
Compressed Archive by Macintosh DiskDoubler.
Debian packages.
Device Driver.
Dictionary file.
Macromedia Director file.
Dynamic Linked Library. Microsoft application file.
Document format for Word Perfect and Microsoft Word.
Microsoft Word Template.
Device Driver.
TWAIN Data source file.
Dial up networking configuration file.
Autocad drawing.
Autocad drawing exchange format file.
Enhanced Windows Metafile.
Microsoft Outlook e-mail file.
Encapsulated PostScript supported by most graphics programs.
Adobe PostScript Level II Encapsulated Postscript.
DOS based executable file which is also known as a program.
Microsoft Fast Find file.
Microsoft Fast Find file.
Macromedia Flash movie format.
Font file.
Graphics Interchange Format that supports animation. Created by CompuServe and used primarily for web use.
Windows global index. Contains the index information used by "Help" in Windows.
Microsoft Program Manager Group.
Unix compressed file.
Macintosh binary hex (binhex) file.
Standard help file.
HyperTerminal files.
Macintosh binary hex (binhex) file.
Hyper Text Markup. This markup language is used for web design.
Hyper Text Markup Language. This markup language is used for web design.
Icon Library File.
Image Color Matching profile.
Microsoft icon image.
Information file used in Windows, often for a definition of hardware.
Initialization file used in Windows.
Java Archive. A compressed Java file format.
Compression scheme supported by most graphics programs. Used predominantly for web use.
More common extension for JPEG described above.
JavaScript File - A text file containing JavaScript programming source code.
Microsoft Excel mailing labels.
Windows 9x startup logo.
eBooks in Microsoft Reader format.
Windows 9x shortcut file.
Application log file.
Autocad (visual) lisp program.
Microsoft Access Query.
Microsoft Access Report.
Microsoft Access DataBase File.
Rose model file. Opens with Visual Modeler or Rational Rose.
MIDI music file.
Microsoft Windows 9.x kernel module.
Quicktime movie.
MPEG Audio Layer 3.
Animation file format.
Microsoft Project File.
Microsoft Outlook message file.
Fidonet messages.
Novell Netware command File.
Novell Netware loadable Module.
Object file, used by linkers.
ActiveX Control: A component of the Windows environment.
Ogg Vorbis digitally encoded music file.
Microsoft Exchange/Outlook offline file.
WAD file that contains information about levels, settings, maps, etc for Quake and Doom.
Printer Control Language file. PCL is a Page Description Language developed by HP.
Macintosh drawing format.
Portable Document File by Adobe. Viewable in a web browser or with Adobe Acrobat Reader.
Printer Description File. Provides printer support for certain applications.
Port driver for windows 95. It is actually a virtual device driver (vxd).
Web page that contains a PHP script. A PHP script is an alternative to CGI scripts. For more
information refer to this FAQ at Linux.com.
Program Information File
Vector graphics GDF file (IBM Mainframe)
Macintosh Compressed archive
Perl source code file.
Perl Module.
PageMaker 3.0 document.
PageMaker 4.0 document.
PageMaker 5.0 document.
PageMaker 6.0 document.
Portable Network Graphic file.
System Policy file for Windows NT.
Microsoft PowerPoint design template.
PostScript Printer description file used in Macintosh and Windows operating systems to provide printer specific features to a driver.
Microsoft PowerPoint slide show.
Microsoft PowerPoint presentation(default extension).
A print file created as the result of "printing to file".
PostScript file.
Native Adobe Photoshop format.
Paint Shop Pro image.
Personal Folder File for Microsoft Outlook.
Microsoft Publisher document.
Windows Password list file.
Quicken Import file.
RealAudio Metafile.
RAR compressed archive created by Eugene Roshall.
Raw File Format.
Raster Document Object. Proprietary file for Xerox Digipath Scan and Makeready workstations.
File in Windows that contains registry settings defining the system and its software.
RealAudio video file.
RedHat Package Manager.
Standard resource file.
Rich Text Format.
Screen Saver file.
Self extracting archive for Macintosh Stuffit files.
Standard Generalized Markup Language.
Unix shell script.
HTML file that supports Server Side Includes(SSI).
Compressed Macintosh Stuffit files.
SEGA mega drive ROM file.
Adobe scalable vector graphics file.
Shockwave Flash file by Macromedia.
DOS swap file.
Windows system file used for hardware configuration or drivers.
Unix Tape Archive.
Targa bitmap.
Tagged Image File Format. Universal graphics format supported by most graphics applications.
Windows temporary file.
True Type font.
Text format used in many word processing packages.
Uniqueness Definition File. Used for Windows unattended installations.
UU encoded file.
Microsoft Visual BASIC source language code file extension.
Virtual Memory file.
Windows 9x virtual device driver.
Waveform sound file.
Windows Metafile (graphics format).
Write Document: This is equivalent to RTF, Rich Text Format, that enables saving text with formatting information.
Winamp Skin.
The GIMP's native image format.
Wang imaging file. Wang Image Viewer comes with Windows 95/2000.
Xerox Image file (same as TIFF).
Image file eXtended by ScanSoft is similar to TIFF and is a Pagis application format.
Microsoft Excel Spreadsheet.
Microsoft Excel Template.
Extensible markup language.
XML style sheet.
Compressed Zip archive for use in Winzip.

 

Frequently Asked Questions

1. Q: Who can assist me?

If you are having a problem with a non-Microsoft product, you should contact the manufacture of the product.

If you are having a problem with a file downloaded from a web site, you should contact the web site. They can let you know the software you will need.

If you are having a problem with a Microsoft product, you can look for answers on the Microsoft Knowledge Base. You can also email us here at the site; we'd be pleased try and help you.

2. Q: What's a file extension?

A: A file extension is a group of 3 or 4 letters at the end of a file name. The extension is generally separated from the file name by a period (or dot). For example, in the file name RESUME.doc, the extension is "doc." The extension tells you that the file is a particular type. In this example, a .doc file is a word-processing document created with Microsoft Word or a Word-compatible program.

3. Q: Do I need a separate program for each file extension?

A: Sometimes but not always. Often programs that perform a similar function (e.g., word-processing programs, graphics editing programs, or accounting programs) can be used with more than one file extension. For example, if you have a file called BANNER.gif, there are dozens of graphics programs that work with the file extension "gif." All you need is one of these programs to be able to view and edit .gif files.

4. Q: I used to be able to open these files? What happened? Why can't Windows open them now?

A: A couple of things might have happened. Assuming that the file has not been emailed to you, then the most likely answer is that you once had a program on your computer that was able to work with this file extension, and now the program is gone. You might have uninstalled the program or deleted it in some other way. Or you could have installed a new program on your computer that supports this file type. New programs often make themselves the default viewer for certain file types. If you later uninstalled the newer program, you might still have a program on your computer that will open the file type, but it is no longer associated with those files because of the newer program that was once installed. To fix this problem, just right-click the file that you want to open, and choose the appropriate program from the Open With choices.

5. Q: What is the impact of this feature on my privacy?

A: None. When you click "Auto-Lookup," the file extension (".zip" for example) is sent to this Web site in order to start a search for supporting software and information. No personal information is sent.

6. Q: The file extension I am looking for is not listed here. What should I do?

A: We recommend visiting CKNOW's FILExt or UK Technical Support. This site will be updated over time with the most commonly used file extensions. This web site only lists the most commonly used file extensions because of the costs involved with maintaining this web site in more than 20 languages.

7. Q: Why doesn't Microsoft Windows automatically download and install the software?

A: Software downloaded from the internet can contain viruses or could cause security problems. It is important that you know who manufactures the software and use that to decide if you want to download the software. Obviously too, most software products require purchase, and can involve substantial cost.

8. Q: How can System Administrators automatically install software?

A: System Administrators can use Microsoft deployment technologies to specify which applications should be installed for certain file extensions. Computers using this deployment technology will automatically install the software the first time the user opens a file with this extension. For more information, see ZAP files in the Windows 2000 or later resource kit under Desktop Configuration Management, Software Installation and Maintenance, and Windows Installer Technology.