How to check the system is Windows 7 or Windows Server 2008 R2 in Wix Installer?

Question

I am working on a windows installer project. And now I only want the software only can be installed on Windows 7 or Windows Server 2008 R2 system, I tried to use this:

Answer 1

Just check for VersionNT 601 or newer, Windows 7 and Server 2008 R2 both have the same value.

= 601]]>