Microsoft .NET Framework 64bit directory.

def FrameworkDir64(self):
        """
        Microsoft .NET Framework 64bit directory.
        """
        # Default path
        guess_fw = os.path.join(self.WinDir, r'Microsoft.NET\Framework64')

        # Try to get path from registry, if fail use default path
        return self.ri.lookup(self.ri.vc, 'frameworkdir64') or guess_fw