@UberLumby said in NeoGeo games folder nolonger working:

I guess it became out of date

It didn't, that bios with crc 0x91b64be3 has been part of the neogeo romset for 2 decades, it's the default neogeo bios (MVS Asia/Europe ver. 6), its presence has always been mandatory in a normal neogeo romset. My guess is that you deleted that bios and put another one (AES or unibios) in its stead, it's a known trick to force another bios in some arcade emulators (it's the only way for pifba iirc), FBNeo doesn't accept that trick though because it has proper means to change bios through core options, and it requires that bios to be present as a fallback if the alternate bios you select in core options isn't available.