I've got a Vista 64-bit installation. Now I'm trying to install my Ray Dream 3D copy on it, but it doesn't work. It's complaining that it needs at least a 32-bit OS to work.
I think RD3D is just too old (it's from 1997) but if anyone knows how to "outsmart" it that would be just fine. Anyway it runs smoothly within a virtual machine like VMWare.