So you want to add a mod to your vanilla game. Well first, what is a mod? All that a mod is, is a collection of files that alter the vanilla game. That’s it. Mods can contain different kinds of files, also called assets. The game will only load these files if they are in the Data folder of the game, and you can only have one version of each file in a given folder. Oh no! That’s a problem if you start adding multiple mods with the same file names. Maybe you want part of one mod, but a different part of another (such as the HUD in Magnum Opus which combines something like 11 different mods).

This is where MO2 shines. MO2 uses a Virtual File System to manage all these different mods. Each mod is stored in its own folder which is located in MO2\mods.