Just Chipping in here.
*is sensitive to puns*
Well, if I open the S3Ms in OpenMPT, I will still get the patterns at least. But the LDS format is another problem, because the only things on my computer that can play them are WinAmp (via AdPlug) and Tyrian itself.
As for the instruments, installing yet another tracker would only further add to my confusion (no thanks to my short attention span),