OK, I'm more than a little bit baffled. Grim Fandango is primarily an English-language game. It was localized to some other languages, but the game already exists in English.
So, what are you trying to accomplish here? Do you have a localized version and want to play it in English? Or have English subtitles for a localized version? And what is this "English file" of which you speak?
Long story short: Give us more details! (Pretty please.)