
To undo the 圆4 change, switch, swap, revert and change back the default media player to Windows Media Player 11 x86 32-bit edition, also open an elevated Command Prompt with administrator privileges, but issue the following command instead: %WinDir%\system32\unregmp2.exe /SwapTo:32 Set the registry subkey Path to %ProgramFiles%\Windows Media Player, and (Default) subkey (normally the first entry) to %ProgramFiles(x86)%\Windows Media Player\wmplayer.exe.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\wmplayer.exe Then, open Registry Editor (regedit), then navigate to the the following registry key: To switch and change to 圆4 or 64-bit of WMP11, open an elevated Command Prompt as administrator and type the following command: %WinDir%\System32\unregmp2.exe /SwapTo:64 First step of unregmp2.exe command change the operating system shortcuts to point to WMP 64bit, while the second registry step changes the file associations default program to WMP 64-bit, which determines which program will be used when you double click on a media file. 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. However, if you decide to use the 64-bit version of WMP11 with your 64bit version of Windows Vista, especially now that more and more codecs Run, and execute %Programfiles%\Windows Media Player\wmplayer.exe.

This is done to avoid and reduce any compatibility issues or problems that may arise with codecs or other DirectShow related plug-ins or add-ons that majority of them still built for 32-bit operating system. In Windows Vista 圆4 (64bit version), the 32-bit edition of Windows Media Player 11 (WMP 11) is set as the default Windows Media Player.
