best answer 11 ptsHow do I make Windows Media Player my default instead of Quick Time (current default)?
Change the file types that play in Windows Media Player
You can make Windows Media Player the default player for a number of file types (formats). You must be logged on as an administrator or a member of the Administrators group to change the file types that the Player will play by default.
Click the arrow below the Now Playing tab, click More Options, and then click the File Types tab.
Select the check boxes of the file types for which you want the Player to be the default player.
The Player may not be able to play a file even though you have selected its file type. This can occur if the file uses a codec that is not installed on your computer. For information about codecs, including how to download them, see the Codecs FAQ.
The Player can play other file types but cannot be set as the default player for them. For more information about all of the file types that the Player supports, see the Microsoft Web site.
Clear the check boxes of the file types (formats) for which you do not want the Player to be the default player.
Clearing the check box next to a file type restores the file type association to the previous default player, if one was specified. If no default player was previously specified and you try to play a file, a Windows dialog box will be displayed so that you can select the program you want to play the file.
If a check box appears dimmed, the Player has only partial ownership of the file type. Multiple file name extensions are assigned to the file type, but the Player only plays some of those extensions by default. To give the Player full ownership of a file type, double-click the dimmed check box.
Notes
Other multimedia playback programs on your computer may interfere with your Player file types settings or prevent you from specifying the Player as the default player for a selected file type. To override the file types settings and specify Windows Media Player as the default player for all of the file types in the list, use the Set Program Access and Defaults feature in Windows. To do so, click Start, point to All Programs, click Set Program Access and Defaults, and then choose the Custom configuration that specifies Windows Media Player as the default media player.
Your AutoPlay settings may affect your Player file types settings. For more information about AutoPlay, see Windows Help and Support.
The Player may not be able to play a file even though you have selected its file type. This can occur if the file uses a codec that is not installed on your computer. For information about codecs, including how to download them, see the Codecs FAQ.
The Player can play other file types but cannot be set as the default player for them. For more information about all of the file types that the Player supports, see the article Windows Media Player multimedia file formats.
