In Microsoft Windows XP and later, when a file system filter driver calls IoRegisterFsRegistrationChange, its notification routine is also called immediately
for all currently registered file systems (that is, file systems that have already called IoRegisterFileSystem but have not yet called IoUnregisterFileSystem).
Because the caller's notification routine can be called even before IoRegisterFsRegistrationChange returns, a filter driver should not call this routine
until after it has created any data structures that it needs in order to process these notifications.
Additionally, in Windows XP and later, IoRegisterFsRegistrationChange ignores RAW devices.