Any known issues with the VM alt scenarios?

[Funkasaurus]

Hey guys, just wanted to get some feedback on an issue I'm having. I'm running Vista and having an issue I never had back in the XP days - the VM alt scenarios will not load up. It's giving me an error message saying that the scenario file couldn't be read. My games are fully up to date on patches and the artwork is all working just fine, it seems that just the scenario files are giving me an issue. Anyone with experience dealing with a similar problem?