Some Arcade ROMs not being detected

I've got a folder of 1668 roms. Several of those are going to be 'bios' files ( for example), but of those 1668 files, only 1582 games are being detected. I know some of these are games.

The first example I have verified as not being dtected is the file This should be a standard variant of the first TMNT arcade game, but it's not getting detected. I renamed a copy of it to and it showed up, but I shouldn't have to do that, right?


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