It's not your typical .CPK file. I've tried several programs like CriPak, Game Graphic Studio, UniExtract, and even BMS scripts.

Looking at the hex data, you can see that there is a chunk at the beginning containing a lot of data that I cannot read (Image 1), followed by a cut and then what appears to be a .PBL header (Image 2)

I think that it contains several PAK files inside. Using publicly available programs on GitHub, I was able to obtain the names of some of the game's assets. It appears to use a similar structure to other Choro Q games.

Just now, BrunoElias2024 said:

It's not your typical .CPK file. I've tried several programs like CriPak, Game Graphic Studio, UniExtract, and even BMS scripts.

Looking at the hex data, you can see that there is a chunk at the beginning containing a lot of data that I cannot read (Image 1), followed by a cut and then what appears to be a .PBL header (Image 2)

I think that it contains several PAK files inside. Using publicly available programs on GitHub, I was able to obtain the names of some of the game's assets. It appears to use a similar structure to other Choro Q games.

Sample

 

TANK.rar

First uint32 Unk, next uint32 Count, following offsets "uint16" multiplied by 2048 which gives you absolute offset. Not sure why they are repeating.

# Shin Combat Choro Q (Japan) (.CPK)

Get UNK Long       
Get FILES Long

PutArray 0 FILES 0

For rip = 0 < FILES
    Get SHORT_OFF Short
    
    Math OFFSET = SHORT_OFF
    Math OFFSET * 0x800
    
    PutArray 0 rip OFFSET
Next rip

For rip = 0 < FILES
    GetArray OFFSET 0 rip
    
    Math NEXT_IDX = rip
    Math NEXT_IDX + 1
    
    If NEXT_IDX < FILES
        GetArray NEXT_OFFSET 0 NEXT_IDX
    Else
        Get NEXT_OFFSET Asize
    EndIf
    
    Math SIZE = NEXT_OFFSET
    Math SIZE - OFFSET
    
    If SIZE > 0
        Log "" OFFSET SIZE
    EndIf
Next rip

QUICKBMS

choro_unpack.zip

Edited February 4Feb 4 by Rabatini