How to set "64-bit" Windows Media Player as the default media player?

I'm using 64-bit version of Windows 8.1 Pro. It always run the 32-bit version of Windows Media Player.

How can I set the 64-bit version as the default player or whenever I chose to open music files with WMP?
I manually set the location of 64-bit wmplayer.exe as default program of music file types. It doesn't work.

I have also tried modifying the registry setting of HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\wmplayer.exe

Which is suggested here. But, still no luck, any ideas?