Unix file names are any sequence of bytes that don't contain 00 or 2F ("/" in ASCII). In this case, it's part of a UTF-8 string that's not valid UTF-8 itself.

Your GUI and terminal operates using UTF-8, but that doesn't mean you can't create a file name that's not UTF-8.

In reply to Re^5: utf8 "\xD0" does not map to Unicode at /path/comparebin.pl line line_number, <STDIN> line line_number by ikegami
in thread utf8 "\xD0" does not map to Unicode at /path/comparebin.pl line line_number, <STDIN> line line_number by igoryonya

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