glacier-modding/RPKG-Tool — reverse-engineered prompt

Build me a modding tool for Glacier Engine RPKG files, mainly aimed at Hitman 3 modding.

I want it to let me open an RPKG archive, see what is inside, extract files out of it, and pack files back into an RPKG without making the process feel scary. Please include both a simple command line version for people who like terminals and a basic GUI for people who just want buttons like open, extract, pack, and choose folder. It would also be useful if the core RPKG logic is reusable as a library so other apps can call it later.

Keep the interface practical and clear, with status messages, error messages that normal users can understand, and support for common modding workflows. I don’t need anything flashy, just a reliable tool that makes working with RPKG files easier.

Use C++ since this is meant to be a native tool. Look up current docs online if you need to.