https://bugs.winehq.org/show_bug.cgi?id=43651
--- Comment #5 from Fabian Maurer dark.shadow4@web.de ---
... but running it with an absolute path *does* cause Z: to show up: $ WINEDLLOVERRIDES="d3dcompiler_46.dll=d;d3dcompiler_47.dll=d" wine ~/.wine/drive_c/Program\ Files\ (x86)/Engine\ Prime/EnginePrime.exe
Now I get it, it only shows up when starting the exe while the working directory is outside of "C:", but inside of "Z:". This way you can also make "F:" show up, just make the working directory in the folder that is mapped as "F:".
That by itself is very odd, does it behave like that on windows, too?
However, I can now reproduce the issue. But only for Z:, if I for example run it from F:\ (mapped as /home/fabian/Ramdisk) it works fine. Very odd, indeed.