Association File Extension / Default Windows 7 and Xp File Extension Types:

Default Windows 7 File Extension Types:

aspx - A file with the ASPX file extension is an ASP.NET Source file.

asf - Advanced Streaming Format (ASF) is an open file format specification for streaming multimedia files containing text, graphics, sound, video, and animation. The default program is Windows Media Player.

asx - Advanced Stream Redirector (.asx) play list files, also known as Windows Media Metafiles, are text files that provide information about a file stream and its presentation. The default program is Windows Media Player.

AudioCD - Audio CD protocol associations.

avi - Audio Video Interleave files. The default program is Windows Media Player.

bak - Usually used to rename a file extension with to make it a backup copy. bak as no associations by default, so this will remove all associations for the bak file extension.

bat - Batch files.

bmp - Bitmap image files. The default program is Windows Photo Viewer.

cab - Cabinet files.

chm - Microsoft compiled HTML help files.

cmd - Windows command script files.

com - MS-DOS application files.

cpp - Program source code written in the C++ programming language; may be a standalone program or one of many files referenced within a programming project; can be viewed with a text editor, but most software development programs will display the text with helpful syntax highlighting

css - Cascading Style Sheet Document file. The default program is Notepad.

cur - Windows File Cursor animation files used for the Microsoft Windows mouse pointer image.

dat - Generic data file created by a specific application; typically accessed only by the application that created the file; may contain data in text or binary format; text-based DAT files can be viewed in a text editor.

dic - The .DIC file extension is a Dictionary file (text file) which can be used as an alternate dictionary on top of the Microsoft Windows Dictionary and may contain an optional set of personalized words which the user has opted to add for spell- checking purposes.

Directory - Directory protocol associations

dll - A Dynamic Link Library (dll) file is a support file used by one or more programs.

drive - Drive protocol associations.

dvr-ms - Microsoft Recorded TV Show file. The default program is Windows Media Center.

exe - Executable application files.

folder - Folder protocol associations.

gif - GIF (Graphics Interchange Format) image files. The default program is Internet Explorer.

gz - Usually associated with Gzip. By default, there is no associated program for this in Windows 7.

h - C or C++ program language header file normally with .C or .CPP file. In computer programming, particularly in the C and C++ programming languages, a header file or include file is a file, usually in the form of source code, that is automatically included in another source file by the compiler. Typically, header files are included via compiler directives at the beginning (or head) of the other source file.

hlp - Help file

hta - HTML (Hypertext Mark-up Language) application. The default program is Microsoft (R) HTML Application host (mshta.exe)

htm - HTML (Hypertext Mark-up Language) document files. The default program is Internet Explorer.

html - HTML (Hypertext Mark-up Language) document files. The default program is Internet Explorer.

ico - Icon files. The default program is Windows Photo Viewer.

img - CD or DVD image file, essentially equivalent to an ISO file.

inf - Setup information files. The default program is Notepad.

ini - The INI file type is primarily associated with 'Initialization/Configuration File'. These files are typically ASCII text with various configuration options set into sections.

iso - Image file.

jpe - JPEG (Joint Photographic Experts Group) image files. The default program is Windows Photo Viewer.

jpeg - JPEG (Joint Photographic Experts Group) image files. The default program is Windows Photo Viewer.

jpg - JPG (Joint Photographic Group) image files. The default program is Windows Photo Viewer.

js - Java Script files. The default program is Microsoft Windows Based Script Host (C:\Windows\System32\wscript.exe).

library-ms - Library folder.
NOTE: To restore the default icons, you may need to do these as well.

• How to Change a Library Icon in Windows 7
• How to Change the Default Libraries Icon in Windows 7

lnk - Shortcut link (LNK) files.

log - LOG is a file extension associated with Log files. It is a text file.

M2TS - Blu-ray BDAV Video File. Video file saved in the high-definition Blu-ray BDAV format; used for saving video data on Blu-ray discs; based on the MPEG-2 transport stream and supports 720p and 1080i formats. BDAV stands for "Blu-ray Disc Audio/Visual," while the M2TS extension refers to "MPEG-2 Transport Stream."

m3u - The M3U file type is primarily associated with 'MP3 Playlist File'. Generally known as a "Winamp" Playlist file, this format has been adopted by a wide variety of MP3 players. The default program is Windows Media Player.

mkv - A Matroska Multimedia Container file is a video format similar to the .AVI, .ASF, and .MOV formats. By default Windows 7 does not have support for opening this file type and has no association. DivXPlayer is a good free program to install that does support playing this file extension. This download will set this file extension back to the default unassociated state in Windows 7.

mov - Movie file. The default program is Windows Media Player.

mp3 - MP3 sound format file. The default program is Windows Media Player.

mp4 - MPEG-4 movie file. The default program is Windows Media Player.

mpa - MPEG audio file. The default program is Windows Media Player.

mpe - MPEG movie file. The default program is Windows Media Player.

mpeg - MPEG (Moving Picture Experts Group) video file. The default program is Windows Media Player.

mpg - MPEG video file. The default program is Windows Media Player.

msc - Mirosoft Common Console document files.

msi - Microsoft Windows Installer installation package file.

msp - Microsoft Windows Installer Patch file.

MTS - MadTracker 2 Sample File. High-definition MPEG Transport Stream video format, commonly called "AVCHD" (Advanced Video Codec High Definition); used by Sony, Panasonic, and other HD camcorders; based on the MPEG-2 transport stream and supports 720p and 1080i HD video formats. MTS files can typically be opened and edited using the software included with Sony and Panasonic HD camcorders. The default program in Windows 7 is Windows Media Player.

otf - Open Type Font file. The default program is Windows Font Viewer.

pbk - Dial-Up Phonebook file. The default program is Remote Access Phonebook.

pdf - Portable Document Format (PDF) is a file format created by Adobe Systems. By default, Windows 7 does not support reading this file type. Using this to restore the default PDF association in Windows 7 will remove all associations for the pdf file extension. You will need to install a 3rd party program like Adobe Reader or Foxit Reader to be able to open and read pdf files in Windows 7.

png - Portable Network Graphics (PNG) is a bitmap compression method for image files. PNG supports 16.7 million colors, it is lossless and also supports index color, grayscale, true color, transparency, and is streamable. It is thus the best compression method (better than GIF or JPEG) for use on the web.

psd - The PSD file format, created by Adobe, contains graphics/photos created by image editing software such as Adobe Photoshop.

reg - Registry files.
NOTE: You may need to set the default program as Registry Editor (C:\Windows\regedit.exe) for reg file extensions, or enable regedit before you will be able to use this REG file.

rtf - Rich Text document files. The default program is WordPad.

scr - Screen Saver files.

tar - Tape Archive file. By default, there is no associated program for this in Windows 7.

tif - Tagged Image files Format. The default program is Windows Photo Viewer.

tiff - Tagged Image files Format. The default program is Windows Photo Viewer.

tmp - Temp file. By default, this file extension does not have a program associated with it.

TS - Video Transport Stream file used for storing video on a DVD; compresses video data using standard MEPG-2 (.MPEG) video compression. TS files are often saved as multiple files on a DVD, i.e. "moviename1.ts," "moviename2.ts," "moviename3.ts," etc. They can be played back by various software DVD players and video editing tools

ttf - True Type font file. The default program is Windows Font Viewer.

TTS - A .tts file is a text file (an ini file) that corresponds to your book. The ToolBook Translation System (TTS) creates the .tts file for you when you set the book's TTS Identifier through the Setup Sources window.

txt - Text document files. The default program is Notepad.

url - Internet website shortcut link. The default program is Internet Explorer.

vbs - Visual Basic Script files. The default program is Microsoft Windows Based Script Host (C:\Windows\System32\wscript.exe).

wav - Wave audio file. The default program is Windows Media Player.

wma - Windows Media Audio files. The default program is Windows Media Player.

wmv - Windows Media Audio/Video file. The default program is Windows Media Player.

wsf - Windows Script Files. The default program is Microsoft Windows Based Script Host (C:\Windows\System32\wscript.exe).

xml - Excel Macro files. The default program is Internet Explorer.

xps - XML Paper Specification document files. The default program is XPS Viewer (C:\Windows\System32\XPSViewer\XPSViewer.exe).

xsl - A eXtensible Stylesheet Language file that defines the style of text, tables, and other objects within a XML document; similar to a .CSS file used by .HTML documents. The default program is Internet Explorer.

zip - ZIP file extensions is a archival and data compression format used to compress one or more files to reduce the size of the file. The default program is Compressed Folders.



Windows^® XP File Association Fixes

The files listed here are all ZIP files, which contain a REG
(Registry) file. Download the ZIP and open it.  Extract the REG file to
your hard disk and double click it.  Answer yes to the import prompt. 
REG files can be viewed in Notepad.  Each of the REG files contains the
default settings for the file extension indicated.  For the ZIP file
fix, the download is a REG file, since ZIP's aren't working anyway!

NOTE:  If your EXE
file associations are corrupted, it can be difficult to open REGEDIT, or to even
import REG files.  To work around this, press CTRL-ALT-DEL and open Task
Manager.  Once there, click File, then hold down the CTRL key and click New
Task (Run).  This will open a Command Prompt window.  Enter
REGEDIT.EXE and press Enter.


Batch File Association
Fix (Restore the default associations for BAT files)

CAB File Association Fix (Restore the
default associations for CAB files)

CHM File Association Fix
(Restore the default associations for CHM files)

COM File Association Fix (Restore the
default associations for COM files)

CPL File Association
Fix (Restore the default associations for CPL files)

Directory Extension Fix (Restores
defaults to HKCR\Directory)

Drive Association Fix
(Restores default settings for hard drives)

EML File Association Fix (Restores
defaults for EML files)

EXE File Association Fix
(Restore default association for EXE files)

Folder Association Fix
(Restore default associations for File Folders)

GIF File Association Fix (Restore
default associations for GIF Files)

HLP File Association Fix (Restore
default associations for HLP files)

HTA File Association Fix
(Restore default associations for HTA Files

HTM/HTML Associations (Restore the default associations for htm/html files)

ICO File Association Fix
(Restore the default association for ico files)

INF File Association Fix (Restore the
default assocation for INF files)

Internet Explorer Desktop Icon Fix
(Restore the default behavior for the Desktop IE icon)

JPE/JPG/JPEG Association Fix (Restore the default associations for jpe/jpg/jpeg
files)

LNK (Shortcut) File Association Fix
(Restores Default Shortcut Behavior)

MPG/MPEG File Association Fix
(Restores default associations for MPG/MPEG files)

MSC File Association Fix (Restore default
associations for MSC files)

MSI File Association Fix (Restore default
associations for MSI files)

MSP File Association Fix (Restore default
associations for MSP files)

REG File Association Fix (Restore default
associations for REG files)

SCF File Association Fix (Restore
default associations for SCF files)

SCR File Association Fix (Restore default
associations for SCR files)

TXT File Association Fix (Restore default
associations for TXT files)

TIF/TIFF File Association Fix (Restores
default associations for TIF/TIFF files)

URL File Association Fix
(Restores default associations for URL - Internet shortcuts)

VBS File Association Fix
(Restores default associations for VBS files)

ZIP Folder Association Fix (Restores
default associations for ZIP Folders - REG File)