It sounds like your going against the grain somewhat in your configuration of GameEx. Systems and MAME are meant to be setup individually either using the built in MAME support or seperate emulators. Secondly, you really dont need to edit the ini files directly. The tools included with GameEx to do configuration are highly robust, and tried and tested. However, you can still configure it as you are trying to. If you have created you own access mdb file it should work fine, just select to use it in the configuration rather than manually fiddling with the ini. Yes, in recent versions publisher is now used instead of developer in the code, unless the publisher field is not a field in the table. When in favorites, the category and manufacturer are only for MAME use, however you can filter by system type in favorites. Also for the screensaver you do need an active MAME setup for it to work, but youve given me a few interesting ideas here for improvements, but like I said you are going against the grain a little, and you might want to abandon your current setup shortcuts approach and start over.