Q – Could you tell me the guitar tuning you used in the acoustic version, found at the music in a foreign language album.

A – It is E Flat major. Just like D tuning but one semitone down. I think the version on the Negatives is in D.
My Eb tuning is the one I use for the black guitar in my live show. Very simple –
From low to high – Eb, Bb, Eb, G, Bb, Eb.