Int32 - Version (?)
Int32 - ID (?)
Int32 - six (wtf)
Few times chunk info, until offset is zero:
...
Offset 0x220: some text, maybe memory pools
...
First chunk: meta info. Contains records.
Second chunk:
16 zeros
Int32 count
Int32 count
Int32 length
Int32 MAGIC
Int32 table_offset
Int32 zero
count times Int32 offset and Int32 zero (of 64 bit offset? Nah)
Content
Int32 count
Int32 count
Int32 length
Int32 MAGIC
Int32 table_offset
Int32 zero
count times Int64 number Int64 number
Unexplored yet
Third chunk: data carried by IGZ?