The "FBneo Romset Version 1.0.0.0" you see circulating on archive sites and private trackers is typically a . It signifies a deliberate freeze—a moment where someone said, "This set works perfectly with the current FBneo core, and no ROMs are missing."
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Note that FBNeo sets differ from MAME sets. While 0.78 MAME set works for some older games, FBNeo v1.0.0.0 is required for newer games. Fbneo Romset Version 1.0.0.0