You need to perform 2 steps each to swap to 64-bit version or to undo the change back to 32-bit version WMP. There is second method that make the WMP 11 圆4 as the default media player for the Windows Vista. Alternatively, you can create a shortcut with target and location set to the above path, and place the shortcut on desktop for easy access. To do so, go to Start -> Run, and execute %Programfiles%\Windows Media Player\wmplayer.exe.
So the first method to use 64-bit Windows Media Player is by launching WMP from its 圆4 location. By default, the 32-bit WMP 11 x86 is located at path of '%Programfiles(x86)%\Windows Media Player', and 64-bit WMP11 圆4 is located at folder of '%Programfiles%\Windows Media Player'.
