http://bugs.winehq.org/show_bug.cgi?id=12881
--- Comment #17 from Dan Kegel dank@kegel.com 2008-05-16 09:29:26 --- Sorry, I steered you wrong. That uuid was for winhttp 5.1, not 5.0, so the DLL I pointed you to won't help. Trying a windows version as you did is a reasonable approach until somebody implements winhttp 5.1 for wine.
I see you still have riched fixmes. Please try winetricks riched20 as suggested by Louis.
This bug is getting awful shaggy... most of this traffic belongs on wine-users...