Want to really mess with someones head? Set one of those as a start page in somebodies browser. A friend of mine did that at the U and the techs were pulling their hair out.
I still wouldn't go so far as to say that XP is a rock. These are mearly agressive web scripts which are the equivalent of a magnitude 1.00 earthquake on the richter scale.
Looks like only one of those tests applies to IE anyway... the rest are aimed at Netscape (n'est pas?). Plus, I believe the C:\CON\CON access bug only affects Win95/98 (could be wrong).