https://bugs.winehq.org/show_bug.cgi?id=55026
--- Comment #10 from Artem S. Tashkinov aros@gmx.com --- Nah, looks like I did everything correctly, here's the export of the appropriate branch:
REGEDIT4
[HKEY_LOCAL_MACHINE\Software\Wine\Server] "RegistrySaveInterval"=dword:00000000 "Test"="1111"