docs: def is_binary_file(file):
      """
      Returns if given file is a binary file.
  
      :param file: File path.
      :type file: unicode
      :return: Is file binary.
      :rtype: bool
      """
  
      file_handle = open(file, "rb")
      try:
          chunk_size = 1024
          while True:
              chunk = file_handle.read(chunk_size)
              if chr(0) in chunk:
                  return True
              if len(chunk) < chunk_size:
                  break
      finally:
          file_handle.close()
      return False