The Mod Compendium is a Windows application created by User:TGE. It allows users to generate replacement CVM files for Persona 3 and Persona 4 by extracting the files from their ISO and combining them with mods selected by the user. It also automatically patches the executable, rendering PersonaPatcher obsolete.
The program is compatible with games that use CPK archives as well, giving you the option to either repack an existing CPK or build a new one containing only your modified files. Many games have executable patches available to make use of a new CPK file (see mod.cpk).
Here are some references of how to use The Mod Compendium: https://amicitia.github.io/guides/p5/mod-compendium https://www.youtube.com/watch?v=IvXjIXwoHbA