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Call me crazy, but I've poured over every Magic Kingdom guide published between 1973 and the opening of EPCOT and I've never found an entry for a quick service stand located here. I did learn that the dining rooms of what is now El Pirata Y El
One theory is that the windows could've been added later (although they're made of the same material as other windows in Caribbean Plaza), when the photo shop existed, and could've feasibly served as pickup locations for photos once they were processed. Or maybe they were just nice windows which just so happened to have been designed with a ledge for transactions and a capacity-concious twin. I still think it was an Ice Cream window.
One thing which supports that they could've been added later: there is only one lantern hanging above the two windows and you know very well that Disney would've had two lanterns had it been intended to be a walk-up service counter area. There isn't even a covered up outlet for a second lantern.
Anybody have any ideas?