>>> open(l[1]+'/'+l[0], "w")
<_io.TextIOWrapper name='&#256;/&#256;\udca0.txt' mode='w' encoding='UTF-8'>
>>> l=os.listdir('\u0100')
>>> l
['&#256;\udca0.txt']
^d

$ perl -E '
sub escapestr {
  $_[0] =~ s/([^\x20-\x7E])/sprintf("\\x%02X", ord $1)/egr
}
say escapestr($_) for <\x{100}/*>'

\xC4\x80/\xC4\x80\xA0.txt