排除系统主题服务的问题后，无法安装themepack文件，问题通常出在文件关联上面，themepack文件使用RUNDLL32.DLL打开，但是不能使用“打开方式”选择，详细的打开方式参数如下：
%SystemRoot%\system32\rundll32.exe %SystemRoot%\system32\shell32.dll,Control_RunDLL %SystemRoot%\system32\desk.cpl desk,@Themes /Action:OpenTheme /file:"%1"
导入如下注册信息即可解决themepack文件的打开关联（记得重启，必要时重建图标缓存）。修复注册表项如下：
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\.themepack]
@="themepackfile"
[HKEY_CLASSES_ROOT\themepackfile]
@="Windows Theme Pack"
"FriendlyTypeName"="@themeui.dll,-2685"
[HKEY_CLASSES_ROOT\themepackfile\DefaultIcon]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,74,00,68,00,\
65,00,6d,00,65,00,75,00,69,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,37,00,30,\
00,34,00,00,00
[HKEY_CLASSES_ROOT\themepackfile\shell]
[HKEY_CLASSES_ROOT\themepackfile\shell\open]
[HKEY_CLASSES_ROOT\themepackfile\shell\open\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\
6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,25,00,53,\
00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,73,00,\
79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,68,00,65,00,6c,00,6c,\
00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,43,00,6f,00,6e,00,74,00,72,00,\
6f,00,6c,00,5f,00,52,00,75,00,6e,00,44,00,4c,00,4c,00,20,00,25,00,53,00,79,\
00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,\
73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,64,00,65,00,73,00,6b,00,2e,00,63,\
00,70,00,6c,00,20,00,64,00,65,00,73,00,6b,00,2c,00,40,00,54,00,68,00,65,00,\
6d,00,65,00,73,00,20,00,2f,00,41,00,63,00,74,00,69,00,6f,00,6e,00,3a,00,4f,\
00,70,00,65,00,6e,00,54,00,68,00,65,00,6d,00,65,00,20,00,2f,00,66,00,69,00,\
6c,00,65,00,3a,00,22,00,25,00,31,00,22,00,00,00
[HKEY_CLASSES_ROOT\.themepack]
@="themepackfile"
[HKEY_CLASSES_ROOT\themepackfile]
@="Windows Theme Pack"
"FriendlyTypeName"="@themeui.dll,-2685"
[HKEY_CLASSES_ROOT\themepackfile\DefaultIcon]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,74,00,68,00,\
65,00,6d,00,65,00,75,00,69,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,37,00,30,\
00,34,00,00,00
[HKEY_CLASSES_ROOT\themepackfile\shell]
[HKEY_CLASSES_ROOT\themepackfile\shell\open]
[HKEY_CLASSES_ROOT\themepackfile\shell\open\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\
6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,25,00,53,\
00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,73,00,\
79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,68,00,65,00,6c,00,6c,\
00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,43,00,6f,00,6e,00,74,00,72,00,\
6f,00,6c,00,5f,00,52,00,75,00,6e,00,44,00,4c,00,4c,00,20,00,25,00,53,00,79,\
00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,\
73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,64,00,65,00,73,00,6b,00,2e,00,63,\
00,70,00,6c,00,20,00,64,00,65,00,73,00,6b,00,2c,00,40,00,54,00,68,00,65,00,\
6d,00,65,00,73,00,20,00,2f,00,41,00,63,00,74,00,69,00,6f,00,6e,00,3a,00,4f,\
00,70,00,65,00,6e,00,54,00,68,00,65,00,6d,00,65,00,20,00,2f,00,66,00,69,00,\
6c,00,65,00,3a,00,22,00,25,00,31,00,22,00,00,00
如果导入以上注册信息后仍然不能双击打开themepack文件，有可能是因为你曾经选择了自定义打开方式造成的，win7默认记住用户自选择的打开方式，并且将其设置为默认优先的打开方式，所以只需要删除以下路径下的user choice文件夹即可（如果存在权限问题，属性修改权限即可）
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.theme
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.themepack