GMLoader
🟢 Updated this monthPreview

🔍 Analysis
- 👍 0.8% endorsement rate
- ✅ Updated 23 days after the latest game patch — actively maintained
- 🏆 #1 of 13 Utilities mods in this game by downloads
📋 About This Mod
A mod loader for Zero Sievert
GMLoader is a program that can load CSharpScript files and recompile non-YYC GM:Studio games, it uses UndertaleModLib as a library to recompile the data.
It will create backup.win at the game root folder and will always recompile from the backup to ensure that you'll never corrupt the data.
Installation and usage
Vortex or Mod Organizer 2 mod managers are supported by GMLoader.
You will only need to run GMLoader once everytime your adding or removing mods that requires GMLoader, this will save your time recompiling the data.
Vortex instruction
Vortex will automatically install GMLoader so you don't need to do anything.
Simply run GMLoader from the dashboard below
Mod Organizer 2 instruction
You need to install the ZERO Sievert MO2 Extension for MO2.
GMLoader itself must be installed manually because of VFS issue, the mods that require GMLoader can still be installed with MO2.
After manually installing GMLoader, restart MO2 if you have it open then click the bar with the game's name below (at the right panel)
Select GMLoader at the dropdown and press Run.
Manual installation instruction
Extract GMLoader archive into the game folder then run GMLoader.exe
Make sure that the extracted files looks like this
Configuration
GMLoader has a configuration file named GMLoader.ini that you can edit to change compilation settings, it's best to leave it by default.
I got Index was outside the bounds of the array error
- []Delete backup.win and verify integrity of the files, if your using MO2 check the overwrite folder and delete the backup.win[/]
I got a game data hash mismatch error
-
[]It's usually caused by game update and the hash code of the data needs to be updated.[/]
My game crashed
- []Copy the crash message then send GMLoader.log that's located at the game folder with the copied crash message to the relevant modding channel.
-
[]Modders Guide[/]
Source Code
UTMT Team - All of this isn't possible without the UTMT tool and library
GMLML - For the ProofOfConcept Code
Eldoofus - Helping my skill issues
Nivx - Band-aid fix for the new GM Runtime
📊 Mod Details
- Game
- Zerosievert Mods
- Author
- Senjay
- Version
- 1.3.3
- Downloads
- 95,204
- Endorsements
- 766
- Category
- Utilities
- Created
- 12/16/2023
- Updated
- 9/12/2026
- Tags
- English, Utilities for Modders, Utilities for Players
🔧 How to Install Zero Sievert Mods
Install via a mod manager (Vortex or Mod Organizer 2). Most mods drop into the game folder.
📖 Full step-by-step install guide for Zero Sievert →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for Zero Sievert commands, item IDs, and more.
Keep browsing — more Zero Sievert mods await