The ZSTD compress algorithm is hide into the exe

About the script udpate , i have done an update .. perfectible but it work

i haven't share it before because no one have give me a response to test it deeper

scripts.npk, shaders and mtlgen can be unpack

all .pyc from the script.npk still have a ZSTD compression

Once_Human_NPK_2026.7z

Edited August 27Aug 27 by Champs

On 8/27/2026 at 2:20 AM, Champs said:

The ZSTD compress algorithm is hide into the exe

About the script udpate , i have done an update .. perfectible but it work

i haven't share it before because no one have give me a response to test it deeper

scripts.npk, shaders and mtlgen can be unpack

all .pyc from the script.npk still have a ZSTD compression

Once_Human_NPK_2026.7z

works! thank you

On 4/13/2026 at 1:20 PM, DKDave said:

It's the same issue mentioned above - the files are compression type 4, which is some form of ZSTD, maybe encrypted, but I don't know in what way.

 

sometimes being a simpleton pays off.

All I did is this on line 109, and now the newer meshes are visible.

	while True:
			try:
				text = mtg.readline().decode("ascii").replace("\x0a", "")
			except:
				pass

On 8/27/2026 at 2:20 AM, Champs said:

The ZSTD compress algorithm is hide into the exe

About the script udpate , i have done an update .. perfectible but it work

i haven't share it before because no one have give me a response to test it deeper

scripts.npk, shaders and mtlgen can be unpack

all .pyc from the script.npk still have a ZSTD compression

Once_Human_NPK_2026.7z

@Champs .mtl and .mtg files are not getting unpacked/decompressed

the ZSTD dictionary inside ONCE_HUMAN.exe

TARGET_DICT_ID = 0x6A4AC76B

DICT_MAGIC = b"\x37\xA4\x30\xEC"

dictionary size look as 112640 byte

16 hours ago, Champs said:

the ZSTD dictionary inside ONCE_HUMAN.exe

TARGET_DICT_ID = 0x6A4AC76B

DICT_MAGIC = b"\x37\xA4\x30\xEC"

dictionary size look as 112640 byte

Ty, this python script can decompress the files after they are unpacked with your bms script . place in same dir as ONCE_HUMAN.exe

unzstd_dict.py

Thks, work fine except on .PYC files

i have rewrite your code with the custom OPMAP and setting for python 3.11

use xdis to use any Python interpreter version (3.11, 3.12, 3.13+)

all the rest is OK .. except .PYC files