Thank you for your answer; I am using MAMEUI64, and putting your suggested MESS file into the Folders section adds a filter, and gives me "Arcade, Fruit Machine, Pinball" under "Category_Full", which is close to what I want... but it does the whole list still, when all I want are the Arcade ROMs in the ROMS folder.
Right clicking that, selecting Custom Filters and then ticking "Non-Working" and "Unavailable" as a further filter looks like it might be doing what I want again though. I just need to go through my old MAME32 folder and update those not visible before I can be sure. So thanks again for now!
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