http://bugs.winehq.org/show_bug.cgi?id=12881
--- Comment #13 from Dan Kegel dank@kegel.com 2008-05-16 09:06:18 --- 7fd52380-4e07-101b-ae2d-08002b2ec713 seems to be winhttp v5.
Wine's winhttp seems to be mostly a stub.
I suppose you could try installing winhttp 5.0. Microsoft no longer offers the download (as far as I know), but you can get it from http://www.pipeboost.com/winhttp.asp
I've never tried this and this is beyond my ken. If it ends up being useful, I can add it to winetricks. Good luck.