Saw this comment on the project mame group on facebook.... did make me wonder if its stuff like this that has GameEx loosing out, which is a shame as I think its one of the most capable and practical front-ends available.
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I honestly don't think anyone else on here uses GameEx - I put a request out ages ago for a review of it for our list of frontends and had no responses.
Does exit on the keyboard still work? If so, you can get around it using keymapping software like JoyToKey.
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Noone seems to be talking much about GameEx.... even on these forums at times! :-)