Mod Organizer 2 - Grand Theft Auto IV

Description

This is a meta-plugin for Mod Organizer 2 that adds native support for Grand Theft Auto IV Complete Edition. It hooks into FusionFix's built-in mod loader — the update/ folder — so MO2's virtual filesystem maps directly onto it. Your MO2 mod list order controls which files take priority, exactly like the numbered folders FusionFix uses by default.

Also supports RTX Remix modding — RTX Remix replacement mods (textures, meshes, configs) stored under rtx-remix/mods/ and rtx_comp/ are managed separately outside MO2's update/ layer, keeping your path-traced content organized alongside your standard mods.

Installation instructions

• []Download Mod Organizer 2 — grab the portable . 7z version. Create a folder (e.g. GTA IV MO2) and extract it there.

  []Download this mod and drop game_gtaiv.py into your MO2 plugins\basic_games\games folder.

  []Launch ModOrganizer.exe, set it up as a portable instance, and point it at your GTA IV install (GTAIV.exe).

  []Make sure FusionFix is installed directly in your game root folder — it is what reads the update/ folder at runtime.

  Main features

  • []Full MO2 virtual filesystem support for GTA IV via FusionFix's update/ mod layer system

    []MO2 load order = FusionFix layer priority — higher mods in the left panel win file conflicts

    []Each MO2 mod maps to a virtual subfolder inside update/, no manual folder renaming needed

    []Save file browsing support via the MO2 Saves tab (Documents\Rockstar Games\GTA IV\Profiles)

    []Supports IV, TBoGT and TLAD content in a single mod install

    []RTX Remix compatible — works alongside path-traced GTA IV setups using rtx-remix/mods/ and rtx_comp/

    Each mod installed through MO2 should mirror the layout used inside the update/ folder:

    Important: ASI plugins and .ini files (e.g. FusionFix.asi, FirstPerson.asi) live in the game root plugins/ folder and are not managed by MO2 — deploy those manually. Standalone .img files may also need manual handling as MO2 manages loose files only.

    RTX Remix: RTX Remix replacement mods live in rtx-remix/mods/ (e.g. gta4rtx/, z_gta4rtx_autopbr/) and RTX Remix configs live in rtx_comp/ — these are outside the update/ layer and should be managed directly on disk. rtx.conf and the rtx_comp/ toml files control RTX Remix settings and are not part of MO2's virtual filesystem.

    Requirements

    • []Grand Theft Auto IV Complete Edition

      []GTAIV. EFLC. FusionFix — required, this is what loads the update/ mods at runtime

      []Mod Organizer 2

      Shout outs

      • []ThirteenAG for GTAIV. EFLC. FusionFix and the update/ mod loader system that makes this possible

        []The Mod Organizer 2 team for the basic_game plugin framework

        []The GTA IV modding community