https://bugs.winehq.org/show_bug.cgi?id=40479
--- Comment #17 from florian.reisenhofer@aon.at --- (In reply to Ker noa from comment #16)
I would say wine is missing LOAD_LIBRARY_SEARCH_SYSTEM32 inLoadLibraryEx according to https://msdn.microsoft.com/en-us/library/windows/desktop/ms684179(v=vs.85). aspx
It seems like the Devs forgot to implement this, or implemented it a long time ago so they forgot to implement this flag when Vista arrived.
Maybe there are other flags also not implemented. The developers should take a look at this page.