I really dont know, but i recommend HL because you can just d/l counter-strike. It really confuses me as to why they made a retail version of CS when you can d/l it... As to compatibility..havent the slightest clue.
i have CS retail and i only had a few probs with the installer that i fixed. i dont think it matters really but if u also want the singleplayer game od hl then buy hl.
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