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1. 首先按照[Answers 分享]注册表编辑器的基本使用方法中的步骤获取以下三个键值的权限：
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
2. 之后，单击开始，点击所有程序，点击附件，右击命令提示符选择以管理员身份运行。
3. 复制下面的命令，在命令提示符中右击选择粘帖，然后按回车键。
%WinDir%\system32\unregmp2.exe /SwapTo:64
4. 打开注册表编辑器(单击开始，在搜索框内输入regedit，按回车键)，然后依次展开至下面的项：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\wmplayer.exe
5. 双击右侧窗格中的Path，设置数值数据为%ProgramFiles%\Windows Media Player，点击确定。
6. 关闭注册表编辑器。
7. 复制以下信息：
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\CLSID\{45597c98-80f6-4549-84ff-752cf55e2d29}\LocalServer32]
@=hex(2):22,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,\
00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,\
4d,00,65,00,64,00,69,00,61,00,20,00,50,00,6c,00,61,00,79,00,65,00,72,00,5c,\
00,77,00,6d,00,70,00,6c,00,61,00,79,00,65,00,72,00,2e,00,65,00,78,00,65,00,\
22,00,20,00,2f,00,45,00,6e,00,71,00,75,00,65,00,75,00,65,00,00,00
[HKEY_CLASSES_ROOT\CLSID\{cdc32574-7521-4124-90c3-8d5605a34933}\LocalServer32]
@=hex(2):22,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,\
00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,\
4d,00,65,00,64,00,69,00,61,00,20,00,50,00,6c,00,61,00,79,00,65,00,72,00,5c,\
00,77,00,6d,00,70,00,6c,00,61,00,79,00,65,00,72,00,2e,00,65,00,78,00,65,00,\
22,00,20,00,2f,00,42,00,75,00,72,00,6e,00,43,00,44,00,00,00
[HKEY_CLASSES_ROOT\CLSID\{ed1d0fdf-4414-470a-a56d-cfb68623fc58}\LocalServer32]
@=hex(2):22,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,\
00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,\
4d,00,65,00,64,00,69,00,61,00,20,00,50,00,6c,00,61,00,79,00,65,00,72,00,5c,\
00,77,00,6d,00,70,00,6c,00,61,00,79,00,65,00,72,00,2e,00,65,00,78,00,65,00,\
22,00,20,00,2f,00,50,00,6c,00,61,00,79,00,00,00
8. 打开记事本，选择粘帖，保存该文件，并设置文件名为set.reg。
9. 双击该set.reg文件以导入相关注册表。
之后再播放音乐文件时默认打开的应该就是64位Windows Media Player 12了。
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