The HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node registry entry indicates that you’re running a 64-bit version of Windows. The OS uses this key to present a separate view of HKEY_LOCAL_MACHINE\SOFTWARE for 32-bit applications that run on a 64-bit version of Windows. When a 32-bit application queries a value under the HKEY_LOCAL_MACHINE\SOFTWARE\[subkey], the application reads from the HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\[subkey].

有意思的是,HKEY_LOCAL_MACHINE\SOFTWARE\Classes下也有个Wow6432Node,里面的东西是HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node的Classes分支。改动一个另一个也会变化。应该是同样的文件被映射到不同的位置去了。