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I think my analysis of the problem when I first hit it was that the opening request got a new return code that meant "OK, but you need to know something", and it was being treated as "no". I.e. it wasn't one of the list of codes that was considered a success. I think it happened at Windows 7, and XP would still work.

The online multi-player modes were dependent on a service that no longer exists, but you were always able to start up a LAN game as host, without having another player connected. That was the part that broke for me.