Use the command to "update" the archive with your new file: CriPakTools.exe "archive.cpk" -replace "modded_file.dds" "internal/path/to/file.dds"
Unpacks the contents of a .cpk file (like images, 3D models, or music) into a readable folder structure. cripack tools
Under , choose where to save the new .cpk and name it identically to the original game file (e.g., bgm.cpk ) . Use the command to "update" the archive with