Olaf, I may have missed this but I think it would be a good idea to have the version of the mixer, etc. be displayed somewhere such as in the help.
When you place any sidebar shps within the mod creator launcher it places them in the directory rather than a sidec01.mix or sidec02.mix. This screws up the sides.
Also, does the quality of the ogg files determine the quality of the converted wav files? It seems to.