Despite its name, is the definitive open-source decompiler and editor for virtually any GameMaker Studio 2 game compiled using the VM export.
At the core of any VM-compiled GameMaker game is the file. This single file is the container for virtually everything that makes up your game: all the sprites, sounds, rooms, object definitions, shaders, and, critically, the GML bytecode.
If you lost your own GMS2 source files, (Git, cloud, external drive) are the real solution. For studying others’ games, focus on official modding APIs or tutorials instead of decompilation.
Other tools exist on GitHub, such as jeason1997/GameMaker-Studio-Decompiler , which can export specific parts of the data file. 3. How to Use GMS2 Decompilers (UndertaleModTool Example) gamemaker studio 2 decompiler
: The decompiler will translate the bytecode back into GML. Note that variable names may be lost or replaced with generic identifiers (e.g., local_var_1 ) depending on the version and optimization settings used. GameMaker Community 4. Important Considerations
Extracts sprites, textures, backgrounds, audio tracks (OGG/WAV), and fonts.
If you are exploring game design, understanding the tools available can help you appreciate the structure of GMS2 games. Despite its name, is the definitive open-source decompiler
This is the most common legitimate use case for decompilation tools among hobbyists. Communities like those around Undertale and Deltarune use tools like UndertaleModTool to unpack game files, edit sprites, change dialogue, and create entirely new content. Because these tools are primarily designed for modding, they excel at allowing you to view and edit the game's assets.
If you are preparing to commercialize your GameMaker project, you should assume that a default VM build can be cracked open within minutes. To safeguard your intellectual property, implement the following defense strategies: Always Export with YYC
Contains every text string used in the game, including variable names. CODE: Contains the compiled GML bytecode. If you lost your own GMS2 source files,
It cannot magically turn complex, compiled machine code (YYC) back into a perfect GMS2 project file, but it gets incredibly close for VM games. DogSled / Altar
A GameMaker Studio 2 decompiler is a software tool designed to open a compiled game data file (like data.win ), extract the embedded assets, and translate the bytecode back into human-readable GameMaker Language (GML) code.
If you are a GameMaker Studio 2 developer, the ease with which VM games can be decompiled might be alarming. Fortunately, there are several steps you can take to secure your intellectual property. Use the YoYo Compiler (YYC)
Converts bytecode back into readable GML scripts, events, and object code.