$rdqm = encode 'UTF-8', decode 'Windows-1252', encode 'UTF-8', $rdqm;

   $rdqm                 => 201D
   encode 'UTF-8'        => E2 80 9D
   decode 'Windows-1252' => 00E2 20AC ????
   [error handling]      => 00E2 20AC FFFD
   encode 'UTF-8'        => C3 A2 E2 82 AC EF BF BD