Problems with "File Association" in Windows 7 64-bit

转载自：http://answers.microsoft.com/en-us/windows/forum/windows_7-files/problems-with-file-association-in-windows-7-64-bit/8a84fcec-22df-4942-8e35-d98dbe96e327?page=1

起因：

原先将一个程序设置为打开xml文件的默认打开程序，后来将这个程序移到了别的地方，原先设置的默认打开方式用不了了，重新选择之后发现带不到open with界面中，即default program列表中没有刚刚选择的程序。

解决方案：

In  regedit: Navigate to  Computer\HKEY_CLASSES_ROOT\Applications and find your  .exe name. 

Navigate under its name to  shell>open>command. In the  Default change its location to the actual location of the executable, hit  okay and then try and reassociate the file type as you normally would.