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my $Folder;
my $Readme;

my %folder_options=('170'=>'winvista',
 '173'=>'winvista64', 
...
 '541'=>'windows*7 graphics', 
 '525'=>'winvista64');
my $Folder=$folder_options{$operatingsystem};

my $Folder;
my $Readme;
...
          last SWITCH;
    } 
}

   use Switch;
   my $Folder;
...
                              $Readme='readme_winvista64.txt';
                            }
    }