if this is a typical reasonably new Linux distro, it's UTF-8 by default, i.e., you are right. He should have done 
open FIND, '-|:encoding(utf8)', 'find /dev/sda2 -name menü'

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In reply to Re^2: binmode STDOUT, ":utf8"; and umlauts by massa
in thread binmode STDOUT, ":utf8"; and umlauts by resistance

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