use Switch;
   my $Folder;
   my $Readme;
    switch ($operatingsystem) {
        case '170'          { $Folder='winvista';
                              $Readme='readme_winvista.txt';
                            }
        case '173'          { $Folder='winvista64';
                              $Readme='readme_winvista64.txt';
                            }
    }