http://bugs.winehq.org/show_bug.cgi?id=24826
--- Comment #10 from Michael Hampton error@ioerror.us 2011-01-08 16:24:27 CST --- Since someone was nice enough to mention this issue had been discussed on the Blizzard forums, I have decided to do the research and locate these forum threads.
(Remember to skip over the obvious trolls, of which there are many.)
1. Links to a standalone utility which will set the LARGEADDRESSAWARE flag, so you don't have to install the whole Windows SDK. This app seems to run OK in Wine. http://us.battle.net/wow/en/forum/topic/1118362581#18 http://www.ntcore.com/4gb_patch.php
2. Provides longer explanation of the issue and a link to a second standalone utility which will set the LARGEADDRESSAWARE flag. This app requires .NET 3.5 so probably won't work very well or at all in Wine. http://us.battle.net/wow/en/forum/topic/1670096715#10
3. Official Blizzard post stating that using LARGEADDRESSAWARE will not get you banned, and providing some other workarounds. http://us.battle.net/wow/en/forum/topic/1658706617?page=6#101
There are other threads, but these were the most useful I found.