AHK Remapped controls in MAME not working

[RealGosthe]

Hi, when i play any of the nfl bitz in MAME if i press the    \    key, which i have mapped to the winipac (4 arcade machine so i ran out of keys, and im not gonna remap in winipac this key  one since im done with all mappings), this menu comes up (see attach pic), so i created an ahk file to remap \ to any other key  but its not working in MAME, i read that MAME  only accepts raw input trough hyperspin and its not recognizing the ahk remap script, so please tell me how can i prevent this menu from appearing or how can i make the ahk remap work in MAME, if i launch MAME directly (not hyperspin) the ahk works.