I'm Following the instruction by evilrat,
but apparently I'm to stupid to run the example.
The application quits with
Error load: QtE5Widgets64.dll which is located next to the EXE-file (also Qt5Core.dll, Qt5Gui.dll and Qt5Widgets.dll).
The error is traced back to
GetHlib() in qte5.d but that's it.
Not sure what Windows does at loading the Qt5Core.dll (it looks for multiple paths where the DLL is also present but it also locks the Qt5Core.dll in the application directory - according Process Monitor) but it seems that's the last DLL which is loaded before the thread is exited.
Any hints are appreciated.