https://bugs.winehq.org/show_bug.cgi?id=46855
--- Comment #2 from IanS MyBugzilla@mailinator.com --- In my first post I included a link to system.drawing.fontfamily so yes. It is system.drawing.
I installed dotnet40 and gdiplus
In drive_c/windows/system32 I see dgi32.dll and gdi32plus.dll
But font in /Windows/Font are still not available to the system.drawing.fontfamily properties. It doesn't see them. It only sees the Linux fonts.