Most new mods for those games require Aemulus and do not work with the Mod Compendium, rendering the latter half of this guide obsolete.
UPDATE : See this guide for using Aemulus for the best experience installing and using P3FES, P4G (PC) and P5 (PS3) mods.
UPDATE : This guide was originally written by Cryptoss, but has been updated by ShrineFox to prevent it from becoming obsolete.
