In this case these are not forbidden path characters, just non-Latin characters without any special meaning. At some point you should say "fuck Latin-1, this lo

In this case these are not forbidden path characters, just non-Latin characters without any special meaning. At some point you should say "fuck Latin-1, this looks like Unicode so we're decoding as Unicode", not "don't use the Latin alphabet? You don't deserve to use a computer". Not being able to use perfectly normal strings like aux or nul as filenames is of course an entirely different category of madness.