Unofficial Highscore.dat (2018/01/22) is released. Highscore.dat is a complimentary file to help Mame in saving high scores.Most Mame games save their high scores by default, but over 2500 games do not save their high scores. The Highscore.dat file tells Mame some additional information and how to read and store the high scores using the /hi directory instead of /nvram.

Download: Unofficial Highscore.dat (2018/03/05)
Source: Here