http://bugs.winehq.org/show_bug.cgi?id=201
--- Comment #32 from alexd14@hushmail.com 2007-12-08 10:22:16 --- Nice to see somebody else is interested :). Btw about the shadow problem I looked into it too - there seems to be a very general problem with 8 bit blits, I filed it as a separate bug with a test case, see bug#10112.
I don't know why that patch wasn't accepted. But I think that if 8 bit blit worked as it should, then maybe igowin would work properly even with GetSystemPaletteEntries left as is. Not sure because it can't be confirmed without a working 8 bit blit.