THX for your help. Unfortunately the hints did not solve the problem. I think I have to deal with the fact that I have no sound with the following movies (using WMP 9.0): https://www.simplymaya.com/movie_page...html?tut_id=33 https://www.simplymaya.com/movie_page...mhtml?tut_id=7 https://www.simplymaya.com/movie_page...html?tut_id=45 https://www.simplymaya.com/movie_page...html?tut_id=23 https://www.simplymaya.com/movie_page...html?tut_id=46