Seems like some of the file names are corrupt.

That's correct. D1 is valid as the start of a two bytes UTF-8 sequence, but you found it at the end of the file name. Looks like the file name got truncated.

In reply to Re: utf8 "\xD1" 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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