dump_vol_dat.py

import struct

FILENAME = "vol2.dat"

i = 0
max_offset = None

with open(FILENAME, "rb") as f:
    f.seek(4 * 2)
    while True:
        z = f.read(4 * 3)
        (offset, length, _) = struct.unpack("<III", z)
        if max_offset is None:
            max_offset = offset

        pos = f.tell()

        f.seek(offset)
        with open(f"extracted/{i}.png", "wb") as f2:
            f2.write(f.read(length))

        f.seek(pos)
        i += 1

        if pos >= max_offset:
            break