I can suggest a few starters for ten Firstly, using Linux rather than Wine, does that file exist on your system? If so, where? Is it in the right place? Secondly, using Linux, if you click the file, does it play? If so, are you running from a desktop icon or from a terminal and are you cd'ing to the Morrowind directory before you run Morrowind? Do you get the Morrowind splash screen or does the music error happen before that? This should break the problem down and provide a few clues as to where to look next.
