the tool can unpack/pack archives ending with .int for the CatSystem engine
Extarct Resources to directory : toolName -e <target archive> <output path> <name mapping string> [regex filter]
Create Resources to archive : toolName -c <resources directory> <create archive path> <name mapping string> [data encrypt mtseed](e.g. 114514 or 0x1BF52)
About name mapping string : CatSystem2 will map file name based on it
and the string is created by game exe, you can get it using Garbro (or your reverse engineering tool)
maybe you can get it with this tool in future, but i can't guarantee, i'm a slacker