I keep everything. Well, so happens I have a purchased copy of XGWorks version 3.0 (CDROM disk). I don't think I ever installed it.
If Yamaha has dropped it, does not support it, and no one can buy it -- I see no copyright issue here? I would be willing to copy (if it will) my original and send one to those interested -- if you'll cover the repro disk and the shipping (your choice of mode).
If I off base about the licensing issue someone please chime in here. I'll take a crack at making a good copy tomorrow.