How can I stop QuickTime from opening WMV embeds?
Click on a .wmv file once, to select it
Then click Command + I (That's the Command key and the letter i key at the same time)
In the resulting dialog box, click the Open With arrow
In the pulldown menu select the app you wish to use to open .wmv
Click the Change All button to force all .wmv files to be opened with your selected application
A must-have free install for handeling .wmv files on a Mac is Flip4Mac. One of the many apps I install when I get a new machine.