I have installed the Warhammer client under a WinXP bottle in 7.1.0 with DirectX installed, as well as the XML parser, just to be on the safe side.
Following certain instructions at the WineHQ appDB entry for this, I added a native winhttp.dll override into the bottle. This allowed the patcher to connect successfully, at first. However, I quickly received a CPP assertion failure. I will get a screenshot of the MS C++ runtime error.
The important pieces of information are:
Program: C:\mythic\warpatch.bin
File: ........\src\libpatchui\win32\uicreator.cpp
Line: 709
Expression: (drawTextResult!=0)
I guess I am stuck for the time being. Perhaps I should try one of the newer builds...
Chris