Unexpected error on MKV file

[Gfy]

Sample txt file to investigate:

http://www.srrdb.com/release/details/The.Darkness.Rage.and.the.Fury.3D.2014.1080p.BluRay.x264-UNVEiL

If it's a renamed RAR file: handle properly.

Traceback (most recent call last):
  File "/var/opt/src/pyrescene/resample/srs.py", line 170, in main
    ftype = file_type_info(ifile).file_type
  File "/var/opt/src/pyrescene/resample/main.py", line 155, in file_type_info
    for archf in rr.list_files():
  File "/var/opt/src/pyrescene/rescene/rar.py", line 1640, in list_files
    self.read_all()
  File "/var/opt/src/pyrescene/rescene/rar.py", line 1627, in read_all
    for block in self:
  File "/var/opt/src/pyrescene/rescene/rar.py", line 1674, in next
    return self.__next__()
  File "/var/opt/src/pyrescene/rescene/rar.py", line 1663, in __next__
    block = self._read()
  File "/var/opt/src/pyrescene/rescene/rar.py", line 1499, in _read
    raise EnvironmentError("Cannot read basic block header.")
EnvironmentError: Cannot read basic block header.
Unexpected Error:
Cannot read basic block header.