I have some doubts about the plurality. If I have 2 computer sound files, instead of saying "sound file A and sound file B," I would like to contract it to a shorter phrase, provided that the listener also knows there are 2 sound files, what should I say?
"sound file A and B" or "sound files A and B"?
Sound files A and B.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.