Microsoft Visual Studio directory.

def VSInstallDir(self):
        """
        Microsoft Visual Studio directory.
        """
        # Default path
        name = 'Microsoft Visual Studio %0.1f' % self.vc_ver
        default = os.path.join(self.ProgramFilesx86, name)

        # Try to get path from registry, if fail use default path
        return self.ri.lookup(self.ri.vs, '%0.1f' % self.vc_ver) or default