MoveFileEx can return ACCESS_DENIED

I observed this on Windows 10, trying to use MoveFileEx with
MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH
to overwrite a running executable.
1f09584d05Andrew Kelley committed on 12/10/2020, 12:32:26 AMparentcad2e8d
1 file changedLine totals unavailable