If mc is started in ru_RU.KOI8-R locale, it can't view files containing KOI8-R symbols. For example, "абвгдежзик" is shown as "012345678:" and "АБВГДЕЖЗИК" as "^^^^^^^^^^Z". Similar problems exist in ALT Linux (which uses Debian utf8-slang2 patch), but only when mc is built with slang2.
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