I'm in favor of leaving it the way it is. The tooltip path shows the forward slash. Book Browser shows the forward slash (if the preference to show the full bookpath is turned on). And the Move dialog itself shows the forward slash whenever selecting existing folders to move resources to. Changing it just to let Windows users continue to make the same mistake over and over (with no notice) makes little sense to me. Make the mistake once, learn what's expected and move on. It's a non-issue in my opinion.
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