https://bugs.winehq.org/show_bug.cgi?id=35027
--- Comment #9 from qsniyg qsniyg@mail.com --- Nevermind, Github's out-of-date indexing lead me to believe the function wasn't implemented. Looks like the USVFS issue lies somewhere else.
CreateProcessInternalW has been implemented in Wine 3.19 (https://www.winehq.org/announce/3.19).