I still don't understand what to specify as the from encoding.
Usually, the file names are text encoded as per the local's encoding. In fact, I dare say that's the expectation.
Most users have a UTF-8 locale. You could assume UTF-8, and worry about it when someone complains.
If you want to actually get the right encoding, your best bet is probably the following undocumented function:
require encoding; # Or "use encoding ();" with the parens.
my $locale_encoding = encoding::_get_locale_encoding();
This is what core module open uses.
And since you mention it, i actually am curious about Windows
It's a real mess. Bad support by builtins and by modules for accessing Windows's wide character interface. Bad support at finding the code page (last time I checked) of the single-byte interface (even though it's easier than locales in unix). Maybe some other time.
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