Extracting .pack and .list files
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To mod the game, you need to modify the files inside the .pack and .list files of the game. There are a few tools that can do this for you.
If you want to know how the .pack and .list files are structured in order to make your own tools, see Structure of .pack and .list files.
BCGM_Python
A tool made by fieryhenry which can be accessed via Codeberg.
Follow the instructions on the README to install the program and decrypt the .pack and .list files into a directory.