code: def _open_next(self):
          
  
          # is the file split over archives?
          if (self._cur.flags & rarfile.RAR_FILE_SPLIT_AFTER) == 0:
              return False
  
          if self._fd:
              self._fd.close()
              self._fd = None
  
          # open next part
          self._volfile = self._parser._next_volname(self._volfile)
          fd = rarfile.XFile(self._volfile)
          self._fd = fd
          sig = fd.read(len(self._parser._expect_sig))
          if sig != self._parser._expect_sig:
              raise rarfile.BadRarFile("Invalid signature")
  
          # loop until first file header
          while 1:
              cur = self._parser._parse_header(fd)
              if not cur:
                  raise rarfile.BadRarFile("Unexpected EOF")
              if cur.type in (rarfile.RAR_BLOCK_MARK, rarfile.RAR_BLOCK_MAIN):
                  if cur.add_size:
                      fd.seek(cur.add_size, 1)
                  continue
              if cur.orig_filename != self._inf.orig_filename:
                  raise rarfile.BadRarFile("Did not found file entry")
              self._cur = cur
              self._cur_avail = cur.add_size
              return True
docs: Proceed to next volume.