https://bugs.winehq.org/show_bug.cgi?id=50385
--- Comment #6 from Zebediah Figura z.figura12@gmail.com --- (In reply to Michael McGuire from comment #5)
Have you tried adding the drive in winecfg? afaik wine won't see it as a separate drive otherwise.
It may not be assigned a DOS letter, but separate file systems should be detected by mountmgr as long as the necessary libraries (dbus) are installed.