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if(system(-r $createdir))
{}
...
$mw->messageBox (-default => 'Ok',-title => 'Alert!',-message => "Crea
+te C:/temp directory first to run the program", -type => 'Ok',);
exit;
}

unless ( -d $createdir ){
  $mw->messageBox (
...
  -type    => 'Ok',);
  exit;
}