http://bugs.winehq.org/show_bug.cgi?id=4066
--- Comment #46 from Adrian Kalla adrian.kalla@gmail.com --- (In reply to Austin English from comment #41)
It's not implemented, and no one has stepped up to write it. It's only used by older games(...)
Ismael Barros did some initial work for GSoC 2008 (Comment #28).
If there would be someone willing to write a working DirectPlay7 implementation in Wine: I'd pledge $100 for that :)
BTW. An easy way to test DirectPlay7 (e.g. for someone wanting to reimplement it) is the freely available The Settlers 3 Demo: http://appdb.winehq.org/objectManager.php?sClass=version&iId=4731