Project Mach2 Concorde sound errors

Hi.I downloaded the Concorde from Project Mach 2 and I've followed all the instructions. Finally I didi it :D but when I try to change the view a dialog window is opened: title: Soundlib-Fehler, message: Sound-file ungueltig. And in some cases the entire game hangs.It sounds german to me and it seems to say file not found or something like this.Anyway, the fsfrance site forums are disabled, so, can anybody help me?Thanks