https://github.com/Provenance-Emu/Provenance/issues/1484 Mednafen has support for custom user generated Palettes: "Custom palettes for a system should generally be named .pal, IE "snes.pal", "pce.pal", etc., and placed in the "palettes" directory beneath the Mednafen base directory. Per-game custom palettes are also supported, and should be named as .pal or ..pal, IE "Mega Man 4.pal" or "Mega Ma..