Nope, you're talking out your rear end Whether it's hidden or not is irrelevant - you try to stick another file in that folder with the same name, it'll overwrite it whether it's visible or not, after asking you. Though if it's ME/XP, WFP should restore the correct one either almost immediately or upon reboot anyway and get rid of whatever junk you attempted to put there.

In any case, I don't want to touch Joel's PC because it sounds completely retarded up after what he's been doing to it