I don't work with multi-byte characters or UTF-8 files. But Perl has an amazing ability to deal with these things.
in reply to Re^2: This looks like whitespace in my CSV but doesn't seem to be
in thread This looks like whitespace in my CSV but doesn't seem to be
From the open() docs, it could be that all you need to do is open the file in the right encoding mode and that could enable even Perl 5.10.X to work. I don't know for sure, but this idea is worth a try.
open(my $fh, "<:encoding(UTF-8)", "filename")
|| die "can't open UTF-8 encoded filename: $!";