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:raw:perlio:encoding(UTF-16LE):crlf:utf8
open my $input_fh, '<:raw:perlio:encoding(UTF-16LE):crlf:utf8', $input_file ... open my $output_fh, '>:raw:perlio:encoding(UTF-16LE):crlf:utf8', $output_file or die "Can't open output file $output_file: $OS_ERROR\n";