I had a very old MAME 2003 plus romset that I used for a very long time. With that, every game, I do remember every single game I tried saved highscores.
I copied the hi files and the highscore.dat, and with Retroarch/FBneo, maybe only 1/3rd of the games save highscores. Plenty of games create .nv and .fs files, but don’t save high scores. Like Darius gaiden for example. What am I doing wrong? Is there any particular highscore.dat file that I should have used with FB neo?