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So first of all Baldur's Gate is not really D&D, it's AD&D, at the time D&D was a different game, ruleset and setting, by the same publisher.
Second, there was no AD&D 2.5
The ruleset existing at the time of the BG games was Advanced Dungeons and Dragons second edition.
In the early 2000's they merged both games into a generic D&D line and called it third edition, a year later they decided to milk the game and released errata for a few of rules, reprinting all books and calling it D&D 3.5.
Woah.... Nerd alert! I just read this comment in my mind with Sheldon's voice (Big Bang Theory).
Grumpypuff made a good post and you just nitpicked him to pieces, LOL.