extract.py

import os
import struct

os.chdir( os.path.dirname( __file__ ) )

fp = r"add01dat.bin"
fs = os.path.getsize(fp)

with open(fp, "rb") as bin:
  offsets = [ ]
  while bin.tell() < fs:
    data = bin.read(4)
    offset = struct.unpack(">I", data)[0]
    offsets.append(offset)
    if not offset: break

  numfiles = len(offsets)
  for i in range(numfiles):
    offset = offsets[i]
    if i + 1 < numfiles:
      size = offsets[i+1] - offset
    else:
      size = fs - offset
    with open(r"add01dat_%02d.bin" % i, "wb") as fout:
      bin.seek(offset)
      fout.write( bin.read(size) )