http://bugs.winehq.org/show_bug.cgi?id=2609
------- Additional Comments From vitaliy@kievinfo.com 2006-23-05 21:00 ------- You can explain that to m$ and the way they created the layout of their OS. Also you can tell that to all the vendors who relay on _that_ particular layout.
Wine uses special tricks to follow as close as possible to what m$ does. One of those tricks is allocating all of the required address space then manage it ourselfs. That's why Wine needs most of the bottom 2GB and first few MB of the 3rd GB (0-0x81000000 addresses).