Win32::Unicode::Native is really helpful when I am directly accessing the dir/file ( or say, in my $main:: scope) because this module overloads bunch of CORE::* functions so that I can open an Unicode path like opening an ANSI path. However for other modules I loaded, like my example given Storable, it won't benefit from Win32::Unicode::Native, and thus my Unicode file path won't work in that module scope.