It’s also possible to edit pack files with PFM (Pack File Manager) or the TW: Assembly Kit (fondly called asskit), but neither of these are recommended: the former is just old and has a habit of eating your entire mod up, and the second just doesn’t work well for modders. This guide will be aimed at WH2, but the ideas are the same for the other games. Therefore, you need to use RPFM for basically every WH2 mod you'll make. RPFM, Rusted Pack File Manager, is a tool to edit pack files.
pack files which contain basically every piece of WH2 data you’ll need – models, stats, text, animations, spells, scripts, numbers.