I second this request, it's a pain to not know the filename in case you have the same title multiple times.

@tdelios you should try
https://forum.recalbox.com/topic/9265/soft-gamelist-editor
it's a very handy tool to keep your gamelists tidy. also, I requested the filename to be displayed from the programmer and he was kind enough to implement this feature. I think it wouldn't hurt to have it displayed in recalbox/EmulationStation also