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TBH, it's not that much of a problem, since I've found that XP is only non-compatible for games over about 3 years old, and even then only some of them.
And to be honest, most people own an older version of windows anyway, so if you want to play older games, it's no great obstacle.
But XP is the most reliable, useful and stable windows platform EVER, and not being able to use a few old games is a small price to play.