...and you can found several sierra classics' custom HD\DVD installers in here;
http://www.sierrahelp.com/Patches-Updat ... llers.html
I played and tested all of them. Some of them are working, some not. But especially Gabriel Knight 2 and Phantasmagoria 1 are fully working. Under the dosbox of course. XP versions of these installers are totally crap. Those games were need native Dos or Win 95-98,no more no less.