I'm using default 6-button WinXP driver for my Powerpad Pro, and it works fine, in fact it's the only gamepad i've ever owned (out of like 5) that has never has any problems. I wish they still sold them.
But does it really matter that 5 and 6 are switched? Be glad it works at all (damn you gravis)
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AMD Athlon 1700+ / 512mb DDRam / GeForce2 GTS / Windows XP