Hello I try: It is about the MP3 File. If i use one, the Error Message comes on Computers which have no MP3 Player on board. It doesn´t matter taking the internal player or external player it always comes the Error. When i use WAV everything is OK. But this is not good, because MP3 is better than WAV. So i think there is no internal Player for MP3 or a courrupted internal Player. If on a Computer is a MP3 Player, there wont be an Error Message. With best regards. Josef Türk Germany