How to Restore Default File Extension Type Associations in Windows 8 - AppzHacker

Here's How:

1. Click/tap on the link of the file extension or protocol in the table below that you would like to restore the default associations of to download it's .reg file.

2. Save the .reg file to your desktop.

3. Double click/tap on the downloaded .reg file to Merge it.

4. If prompted, click/tap on Run, Yes (UAC), Yes, and OK.

   Tip

• If you are signed in as a standard user account, then you will also get a Cannot import type error. Just click/tap OK for it. This is normal since what cannot be imported can only be done so by an administrator account instead. It will still restore the default associations of the file extension if the standard user used Open with to select the wrong program to open the file with.

• If the .reg file is not able to Merge, then double check in Default Programs to make sure that the .reg file extension has it's Current Default program set as Registry Editor (C:\Windows\regedit.exe). Afterwards, try merging the .reg file again.

5. Sign out and in, or restart the computer to apply.

6. If you are logged in as a standard user and this still does not help, then have the administrator also merge the needed .reg file for the listed file extension or protocol below while logged into their administrator account.

7. When finished, you can delete the downloaded .reg file if you like.



Default Windows 8 File Associations:

File Type or Protocol	Default Program	Description
.3gp	Video app	Audio and video container format developed by the 3rd Generation Partnership Project (3GPP); designed as a multimedia format for transmitting audio and video files between 3G cell phones and over the Internet; commonly used by mobile phones that support video capture.
.avi	Video app	Audio Video Interleave (AVI) files
.bat		Windows batch file
.bmp	Photos app	Bitmap image files
.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.
Directory		Directory protocol associations
Drive		Drives
.exe		Executable application files
Folder		All folders except library folder
.gif	Photos app	Graphics Interchange Format (GIF) image files
.htm	Internet Explorer	HTML (Hypertext Mark-up Language) document files
.html	Internet Explorer	HTML (Hypertext Mark-up Language) document files
.ico	Windows Photo Viewer	Icon file
.img		CD or DVD image file
.iso		Disk image file
.jpe	Photos app	Compressed image format standardized by the Joint Photographic Experts Group (JPEG)
.jpeg	Photos app	Compressed image format standardized by the Joint Photographic Experts Group (JPEG)
.jpg	Photos app	Compressed image format standardized by the Joint Photographic Experts Group (JPEG)
.library-ms		Library folder
.lnk (LNK)		Shortcuts
mailto		URL:mailto
.mp3	Music app	MP3 sound format file
.mp4	Video app	MPEG-4 movie file
.msu	Windows Update Standalone installer	Windows Update Standalone Package
.pdf	Reader app	Portable Document Format (PDF) File
.theme	Personalization CPL	Windows Theme File
.themepack	Personalization CPL	Windows Theme Pack File
.txt	Notepad	Text files
.url	Internet Explorer	Internet website shortcut
.vhd		Virtual Hard Disk image file
.wav	Music app	Wave audio file
.wmv	Video app	Windows Media Audio/Video file
.zip		Compressed folders

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