To access a game's inner workings, you must locate the game's data file, usually named data.win . 1. Locating the Data File Search the game folder for data.win .

(GMS2), several community-led open-source tools exist that can extract assets and approximate source code from compiled games. These tools are primarily used for modding or recovering lost project files. Common GMS2 Decompilation Tools

Before you start downloading and experimenting, be aware of the potential risks:

If you want to study how a GameMaker game works for educational or modding purposes, prioritize safety and ethics. Use Trusted, Open-Source Repositories

Open the folder and run UndertaleModTool.exe .

Do you have the (like data.win ) intact?

Extracting and modifying the data.win file for Undertale/Deltarune 10 Nov 2018 —

It allows you to open a game's data.win file, browse all internal GML scripts, extract sprites, modify values, and even recompile changes back into the game.

Before you click on random download links, it is crucial to understand what these tools actually do, the legal risks involved, and how to safely analyze GameMaker data. What is a GameMaker Studio 2 Decompiler?

Always check the game’s policy on asset use.

: After making edits, go to File > Save . This overwrites the original data.win file. It is highly recommended to backup the original file before saving.