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Mod Organizer 2 meta-plugin to make creating game plugins easier and faster.

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Mod Organizer 2 - Simple Games Plugin

Mod Organizer 2 meta-plugin to make creating game plugins easier and faster.

Why?

In order to create a MO2 game plugin, one must implement the IPluginGame interface. This interface was initially designed for Bethesda games such as the Elder Scrolls or Fallout series and thus contains a lot of things that are irrelevant for most games.

The goal of this meta-plugin is to allow creating game plugins for "basic" games by providing a very simple python class.

How to install?

Download the archive for your MO2 version and extract it directly into your MO2 plugins folder.

  • Mod Organizer 2.3.2: Download and extract in your plugins/ folder (see below).
  • Mod Organizer 2.4: Basic games is included in Mod Organizer 2.4.
    • If you want to use new game plugins that have not been included in the release, download the latest archive and extract the files in the existing basic_games folder, overwriting existing files.

Important: Extract the folder in your plugins folder, not the individual files. Your plugins folder should look like this:

dlls/
plugins/
  data/
  basic_games/
    games/
      __init__.py
      ...
    __init__.py
    basic_game.py
    ...
  bsa_extractor.dll
  ...
ModOrganizer.exe

You can rename modorganizer-basic_games-xxx to whatever you want (e.g., basic_games).

Supported games

Game Author File Extras
The Binding of Isaac: Rebirth — STEAM EzioTheDeadPoet game_thebindingofisaacrebirth.py
  • profile specific ini file
Control — STEAM / GOG / EGS Zash game_control.py
Darkest Dungeon — GOG / STEAM erri120 game_darkestdungeon.py
  • save slot parsing
  • mod data checker
Dark Messiah of Might & Magic — STEAM Holt59 game_darkmessiahofmightandmagic.py
  • save game preview
Dark Souls — STEAM Holt59 game_darksouls.py
Divinity: Original Sin (Classic) — STEAM LostDragonist game_divinityoriginalsin.py
  • save game preview
Divinity: Original Sin (Enhanced Edition) — STEAM LostDragonist game_divinityoriginalsinee.py
  • save game preview
  • mod data checker
Dragon's Dogma: Dark Arisen — GOG / STEAM EzioTheDeadPoet game_dragonsdogmadarkarisen.py
Dungeon Siege II — GOG / STEAM Holt59 game_dungeonsiege2.py
  • mod data checker
Kingdom Come: Deliverance — GOG / STEAM / Epic Silencer711 game_kingdomcomedeliverance.py
  • profile specific cfg files
METAL GEAR SOLID 2: Sons of Liberty — STEAM AkiraJkr game_metalgearsolid2mc.py
METAL GEAR SOLID 3: Snake Eater — STEAM AkiraJkr game_metalgearsolid3mc.py
Mirror's Edge — GOG / STEAM EzioTheDeadPoet game_mirrorsedge.py
Mount & Blade II: Bannerlord — GOG / STEAM Holt59 game_mountandblade2.py
  • mod data checker
Need for Speed: High Stakes uwx game_nfshs.py
No Man's Sky - GOG / Steam EzioTheDeadPoet game_nomanssky.py
S.T.A.L.K.E.R. Anomaly — MOD Qudix game_stalkeranomaly.py
  • mod data checker
Stardew Valley — GOG / STEAM Syer10, Holt59 game_stardewvalley.py
  • mod data checker
STAR WARS™ Empire at War: Gold Pack - GOG / STEAM erri120
Subnautica — STEAM / Epic dekart811, Zash game_subnautica.py
  • mod data checker
  • save game preview
Subnautica: Below Zero — STEAM dekart811, Zash game_subnautica-below-zero.py
  • mod data checker
  • save game preview
Train Simulator Classic — STEAM Ryan Young game_trainsimulator.py
Valheim — STEAM Zash game_valheim.py
  • mod data checker
  • overwrite config sync
  • save game support (no preview)
Test Drive Unlimited uwx game_tdu.py
Test Drive Unlimited 2 — STEAM uwx game_tdu2.py
The Witcher: Enhanced Edition - GOG / STEAM erri120 game_witcher1.py
  • save game parsing (no preview)
The Witcher 3: Wild Hunt — GOG / STEAM Holt59 game_witcher3.py
  • save game preview
Tony Hawk's Pro Skater 3 uwx game_thps3.py
Tony Hawk's Pro Skater 4 uwx game_thps4.py
Tony Hawk's Underground uwx game_thug.py
Tony Hawk's Underground 2 uwx game_thug2.py
Trackmania United Forever — STEAM uwx game_tmuf.py
Yu-Gi-Oh! Master Duel — STEAM The Conceptionist & uwx game_masterduel.py
Zeus and Poseidon — GOG / STEAM Holt59 game_zeusandpoiseidon.py
  • mod data checker

How to add a new game?

You can create a plugin by providing a python class in the games folder.

Note: If your game plugin does not load properly, you should set the log level to debug and look at the mo_interface.log file.

You need to create a class that inherits BasicGame and put it in a game_XX.py in games. Below is an example for The Witcher 3 (see also games/game_witcher3.py):

from PyQt6.QtCore import QDir
from ..basic_game import BasicGame


class Witcher3Game(BasicGame):

    Name = "Witcher 3 Support Plugin"
    Author = "Holt59"
    Version = "1.0.0a"

    GameName = "The Witcher 3"
    GameShortName = "witcher3"
    GameBinary = "bin/x64/witcher3.exe"
    GameDataPath = "Mods"
    GameSaveExtension = "sav"
    GameSteamId = 292030

    def savesDirectory(self):
        return QDir(self.documentsDirectory().absoluteFilePath("gamesaves"))

BasicGame inherits IPluginGame so you can override methods if you need to. Each attribute you provide corresponds to a method (e.g., Version corresponds to the version method, see the table below). If you override the method, you do not have to provide the attribute:

from PyQt6.QtCore import QDir
from ..basic_game import BasicGame

import mobase


class Witcher3Game(BasicGame):

    Name = "Witcher 3 Support Plugin"
    Author = "Holt59"

    GameName = "The Witcher 3"
    GameShortName = "witcher3"
    GameBinary = "bin/x64/witcher3.exe"
    GameDataPath = "Mods"
    GameSaveExtension = "sav"
    GameSteamId = 292030

    def version(self):
        # Don't forget to import mobase!
        return mobase.VersionInfo(1, 0, 0, mobase.ReleaseType.final)

    def savesDirectory(self):
        return QDir(self.documentsDirectory().absoluteFilePath("gamesaves"))

List of valid keys

Name Description IPluginGame method Python
Name Name of the plugin name str
Author Author of the plugin author str
Version Version of the plugin version str or mobase.VersionInfo
Description Description (Optional) description str
GameName Name of the game, as displayed by MO2 gameName str
GameShortName Short name of the game gameShortName str
GameNexusName Nexus name of the game (Optional, default to GameShortName) gameNexusName str
GameValidShortNames Other valid short names (Optional) validShortNames List[str] or comma-separated list of values
GameNexusId Nexus ID of the game (Optional) nexusGameID str or int
GameBinary Name of the game executable, relative to the game path binaryName str
GameLauncher Name of the game launcher, relative to the game path (Optional) getLauncherName str
GameDataPath Name of the folder containing mods, relative to game folder dataDirectory
GameDocumentsDirectory Documents directory (Optional) documentsDirectory str or QDir
GameIniFiles Config files in documents, for profile specific config (Optional) iniFiles str or List[str]
GameSavesDirectory Directory containing saves (Optional, default to GameDocumentsDirectory) savesDirectory str or QDir
GameSaveExtension Save file extension (Optional) savegameExtension str
GameSteamId Steam ID of the game (Optional) steamAPPId List[str] or str or int
GameGogId GOG ID of the game (Optional) gogAPPId List[str] or str or int
GameOriginManifestIds Origin Manifest ID of the game (Optional) originManifestIds List[str] or str
GameOriginWatcherExecutables Executables to watch for Origin DRM (Optional) originWatcherExecutables List[str] or str
GameEpicId Epic ID (AppName) of the game (Optional) epicAPPId List[str] or str
GameEaDesktopId EA Desktop ID of the game (Optional) eaDesktopContentId List[str] or str or int

You can use the following variables for str:

  • %DOCUMENTS% will be replaced by the standard Documents folder.
  • %GAME_PATH% will be replaced by the path to the game folder.
  • %GAME_DOCUMENTS% will be replaced by the value of GameDocumentsDirectory.

Extra features

The meta-plugin provides some useful extra feature:

  1. Automatic Steam, GOG, Origin, Epic Games and EA Desktop detection: If you provide Steam, GOG, Origin or Epic IDs for the game (via GameSteamId, GameGogId, GameOriginManifestIds, GameEpicId or GameEaDesktopId), the game will be listed in the list of available games when creating a new MO2 instance (if the game is installed via Steam, GOG, Origin, Epic Games / Legendary or EA Desktop).
  2. Basic save game preview / metadata (Python): If you can easily obtain a picture (file) and/or metadata (like from json) for any saves, you can provide basic save-game preview by using the BasicGameSaveGameInfo. See games/game_witcher3.py and games/game_bladeandsorcery.py for more details.
  3. Basic local save games (Python): profile specific save games, as in games/game_valheim.py.
  4. Basic mod data checker (Python): Check and fix different mod archive layouts for an automatic installation with the proper file structure, using simple (glob) patterns via BasicModDataChecker. See games/game_valheim.py and game_subnautica.py for an example.

Game IDs can be found here:

  • For Steam on Steam Database
  • For GOG on GOG Database
  • For Origin from C:\ProgramData\Origin\LocalContent (.mfst files)
  • For Epic Games (AppName) from:
    • C:\ProgramData\Epic\EpicGamesLauncher\Data\Manifests\ (.item files)
    • or: C:\ProgramData\Epic\EpicGamesLauncher\UnrealEngineLauncher\LauncherInstalled.dat
  • For Legendary (alt. Epic launcher) via command legendary list-games or from: %USERPROFILE%\.config\legendary\installed.json
  • For EA Desktop from <EA Games install location>\<game title>\__Installer\installerdata.xml

Contribute

We recommend using a dedicated Python environment to write a new basic game plugins.

  1. Install the required version of Python --- Currently Python 3.11 (MO2 2.5).
  2. Remove the repository at ${MO2_INSTALL}/plugins/basic_games.
  3. Clone this repository at the location of the old plugin ( ${MO2_INSTALL}/plugins/basic_games).
  4. Place yourself inside the cloned folder and:
# create a virtual environment (recommended)
py -3.11 -m venv .\venv
.\venv\scripts\Activate.ps1

# "install" poetry and the development package
pip install poetry
poetry install