ZenHAX

Yeah it's just zlib and indeed the format is totally different than the
one of the other sample.
This script is only in case you don't want to use offzip since I have
no idea regarding the content of the data.

###
idstring "FBCHUNKS"
get VER short
get HEADER_SIZE long
get ZSIZE long
savepos HEADER_OFF
get SIZE long
get YEAR short
get FLAGS short
if FLAGS & 1 # or year 2021
get SOME_CRC long
get FILE_SIZE long
math NUM = 8
else # or FLAGS & 8, or year 2020
math NUM = 4
endif
for x = 0 < NUM
get DUMMY short
next x
get NAME string
xmath OFFSET "HEADER_OFF + HEADER_SIZE"
if FLAGS & 1
clog NAME OFFSET ZSIZE SIZE
else
log NAME OFFSET ZSIZE
endif
###