Here's How:
1. Click on the file extension type link listed below for the one that you wish to restore to default to download it's .zip file.
2. Save the .zip file to your desktop.
3. Open the .zip file, then extract the .reg file to the desktop.
4. Right click on the .reg file and click on Merge.
5. Click on the Run button in the Security Warning pop-up.
6. Click on Continue (UAC), Yes, and OK when prompted.
7. When done, you can delete the downloaded .zip and .reg files on the desktop if you like.
8. Log off and log on, or restart the computer to apply.
AudioCD - Audio CD protocol associations.
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.
avi - Audio Video Interleave files. The default program is Windows Media Player.
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.
cur - Windows File Cursor animation files used for the Microsoft Windows mouse pointer image.
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.
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.
lnk - Shortcut link (LNK) files.
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.
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.
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.
otf - Open Type Font file. The default program is Windows Font Viewer.
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.
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.
ttf - True Type font file. The default program is Windows Font Viewer.
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).
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).
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.
NOTE: This is a .reg file for the ZIP download only, so go to step 4 after downloading it.
