I'm filing related bugs under this same issue. ``` import plistlib dat = b'Q\xe4\xfeAIAAAAAAAAwAAA\xc9A\xc1AAA\xc1AAAAAAA\x9cAAAAAAAAAAAAAAnAAA\x00\x00\x00\x00\x00\x00\x00\x0b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00AA' plistlib.loads(dat, fmt=plistlib.FMT_BINARY) ``` raises ``` Traceback (most recent call last): File "repro.py", line 3, in <module> plistlib.loads(dat, fmt=plistlib.FMT_BINARY) File "/usr/lib/python3.5/plistlib.py", line 1006, in loads fp, fmt=fmt, use_builtin_types=use_builtin_types, dict_type=dict_type) File "/usr/lib/python3.5/plistlib.py", line 997, in load return p.parse(fp) File "/usr/lib/python3.5/plistlib.py", line 623, in parse return self._read_object(self._object_offsets[top_object]) File "/usr/lib/python3.5/plistlib.py", line 699, in _read_object result = self._fp.read(s).decode('ascii') UnicodeDecodeError: 'ascii' codec can't decode byte 0xe4 in position 0: ordinal not in range(128) ``` It seems only `InvalidFileException` should be raised by this function.