The likely reason that it isn't supported is no one wanted to play it online, no demand, etc.
Some games that list themselves as Nintendo WFC capable don't actually use the original Gamespy server, instead using a different server that is supplied by the game devs themselves, it's likely that's the case with that game you mentioned
Some games that list themselves as Nintendo WFC capable don't actually use the original Gamespy server, instead using a different server that is supplied by the game devs themselves, it's likely that's the case with that game you mentioned
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