Make the 64-bit version of Windows Media Player 11 the default player in Windows Vista x64

Windows Vista x64 users may want to take one additional step because the 64-bit Windows Vista defaults to the 32-bit version of Windows Media Player 11 to ensure broad file and media compatibility. To specify the 64-bit version of Windows Media Player 11 as the default WMP player for 64-bit Vista, we need to redirect a few program shortcuts.

The 32-bit WMP11 program is located in the '.../ProgramFiles(x86)/' folder, while the native 64-bit version of WMP11 is located in the '.../ProgramFiles/' folder.

To set your Vista x64 operating system to default to the 64-bit version of Windows Media Player 11:

Go to Start (the Vista icon in the lower left corner) > and use one of the following commands (without quotes)...

To set 64-bit WMP11 as default player type: "unregmp2.exe /SwapTo:64"

To revert to 32-bit WMP11 as the default player type: "unregmp2.exe /SwapTo:32"

From now on in Windows Vista x64 you will automatically be able to watch DVDs on the 64-bit version of Windows Media player 11. On the off chance the SwapTo command doesn't work, there is a more advanced set of commands detailed here.