Mp3 skull problems plz read.?

Ok firs off, i went mp3skull found a song And then i clicked download on a song on mozilla firefox and it said to open file with windows media player or save file i tried to save the song to windows media player and it worked then a little i popped up beside the song and it said could not open file ore something can anyone help me or tell me if they've had this similar problem also im new to mp3 skull,THANK:)