Hi, thanks for your interest!
When MicroIllusions went bankrupt, the assets of the company were bought by HollyWare entertainment, which was the company founded by David Boyles (the former head of sales for MicroIllusions).
Over the years I have made many attempts to contact HollyWare about getting the rights back to my work - included sending a registered letter - and they have never answered any of my inquiries.
I know that the company still exists, because they have a website which has been updated recently. So at this point I'm not sure how to proceed.