https://bugs.winehq.org/show_bug.cgi?id=42446
--- Comment #57 from Stan markau0@lycos.com --- Using GetFullPathName to translate the path name that GetVolumePathNameW receives did seem to initially work for Native Access but it broke a lot of the volume tests as well, so GetFullPathName is not suitable to translate the path names (and deal with the forward slash path name problem) in GetVolumePathNameW.
So the previous code to scan the GetVolumePathNameW path name and replace forward slash's with back slashs is the one that works and the volume tests pass (Comment 44, Comment 45, Comment 46)