Please don't insult me; I am not stupid enough to use Vista willingly
It is interesting to note that you make your own insult in your response; you imply that users of Vista are stupid (and you are not one of them)
Anyways, Vista vs. XP discussions aside, I just tested it fine on Vista x64 and it seems to work well.
As a sidenote, when I play Savage 2 under Vista, I have to answer an administrative prompt because the publisher of the game is unknown (just wanted to make sure that you are aware of that fact and that it makes the game seem less professional than it should be considering the amount of effort and quality you and your team have put into it).
It is certainly a small thing that can be easily ignored but I thought I should mention it ;o)