The only program that no longer works after upgrading to winXP RC1 is Quicktime 5 in IE6 (Apple toss). It works fine on it's own but just doesn't embedded movies in web pages.

Has anyone managed to get round this?

Nope. Haven't figured out a workaround, but am experiencing the same problem. I really don't want to have to reinstall 2000... I saw on deja.com that someone said he was able to fix it by installing IE 5.5, but didn't say HOW he installed 5.5, cause I can't seem to be able to do it...

this sucks....
.mov is no longer loaded in IE6
manual copying and pasting embedded link is such a pain