issues with unicode support

[Amr Hassan]

trying to read unicode tags as the following:

   TagLib::FileRef f = TagLib::FileRef(filePath);
  
    QString artist = TStringToQString(f.tag()->artist());
    QString title = TStringToQString(f.tag()->title());

when i read a char like Æ, it reads it as ? (a question mark)
why?
a little help would be deeply appreciated..
-- amr