You need to arrange to get one from the other.
ERROR_ARENA_TRASHED error code?
The storage control blocks were destroyed.
Reported incorrectly since the day it was written.
CreateFileMapping that always reported ERROR_ALREADY_EXISTS
Maybe because it already exists?
Using data structures you already knew.
Keeping things moving.
Compatibility, of course.
CreateProcess
Putting the handles in a private container.
ReadDirectoryChangesW
You can track the file ID.
Otherwise, it'll get mapped back down to the 8-bit code page.