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#21
The difference is definitely a possible explanation.
Come to think of it, there was quite a delay inbetween the x86 release and x64. It may well be that the x64 build is sufficiently different to leave it still usable on 7, whereas the x86 isn't so lucky.
Not sure about that, its a possibility at any rate. Fairly academic anyway, it either works or it doesn't, the why is kinda beside the point.