I got reminded of this utility just before Christmas - unfortunately for me, running Windows Server 2003 as my primary laptop operating system, it doesn't work :(, but if you are running XP, here is a quick and easy (but unsupported by Microsoft PSS) utility to be able to mount an ISO image as a drive and extract files as needed. Under Windows Server 2003, there are several alternate options open to you - one I particularly like is ISO Buster, although you have to extract the entire ISO to local disk. I've also just noticed that ISO Buster was updated to version 1.9 over the Christmas holidays, so I'll have to go take a look at whats changed now....