強制設定Windows7 x64位元系統預設使用64位元版的WMP12

64位元的Windows 7同時包括了32位（x86）和64位（x64）版本的Windows Media Player 12，主要考量當然是相容性的問題，但是追求64位元系統的人當然要讓應用程是儘量全數跑64位元版程式！
先前Vista時代還有介面可以選擇媒體檔案預設用WMP 64位元版執行，到了Windows7卻不見蹤影。必須仰賴以下方法啟用：
How to Switch and Set 64-bit Windows Media Player As Default Media Player

1. Run Registry Editor (RegEdit).
2. Take ownership and grant full control of registry keys listed below to unlock the registry keys:
   HKLM\Software\CLASSES\CLSID\{cdc32574-7521-4124-90c3-8d5605a34933}\LocalServer32
   HKLM\Software\CLASSES\CLSID\{45597c98-80f6-4549-84ff-752cf55e2d29}\LocalServer32
   HKLM\Software\CLASSES\CLSID\{ed1d0fdf-4414-470a-a56d-cfb68623fc58}\LocalServer32
3. Open an elevated command prompt as administrator and type the following command:
   %WinDir%\system32\unregmp2.exe /SwapTo:64
4. Run Registry Editor (RegEdit) and navigate to the following registry key:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\wmplayer.exe
5. Double click on the registry subkey Path and set its value data as %ProgramFiles%\Windows Media Player. By default, it has the value data of 「%ProgramFiles （x86）%\Windows Media Player」.