I'm on Linux now, but I know I used it on my last Windows machine, which I'm pretty sure was Windows 8. (For the record, I was trying to see if I could use it to make better maps of certain zones for the wiki; not a cheater
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I don't remember having to do anything special to make it work (but it was awhile ago so I may have forgotten). I know that doesn't really help much, but at least it means it's (probably) possible on Win 7.
Alternatively, another way to learn zones is to get a rogue to level 20 or so; I understand they can go almost anywhere at that point.