The primary tool for this purpose is UndertaleModTool . You can download it from its official GitHub repository.
The user experience varies wildly depending on your technical proficiency.
This is a complex task that requires in-depth knowledge of programming, reverse engineering, and specifically, the GameMaker Studio 2 engine. Here's a simplified overview of steps you might consider if you were to attempt putting together a piece of a decompiler: gamemaker studio 2 decompiler
Hardware failures, corrupted hard drives, and accidental deletions happen. If an indie developer loses their original GameMaker project directories but still has a compiled VM backup of their game, a decompiler is a lifesaver. It allows them to recover their lost assets, scripts, and room layouts, saving hundreds of hours of redundant work. 2. Game Modding and Localization
By default, GameMaker compiles games using a Virtual Machine. The primary tool for this purpose is UndertaleModTool
The VM export is the default and fastest way to test a game.
The existence of GameMaker Studio 2 decompilers highlights the open nature of the engine's default virtual machine architecture. While these tools serve as invaluable assets for modders, students, and developers recovering lost data, they also present legitimate security risks regarding intellectual property theft. By understanding how compilation works and actively utilizing the YoYo Compiler (YYC) alongside obfuscation techniques, you can enjoy the ease of developing in GameMaker while keeping your source code secure. If you want to secure your project, tell me: Are you currently exporting using ? This is a complex task that requires in-depth
If you are a GameMaker Studio 2 developer concerned about intellectual property theft, there are concrete steps you can take to secure your project against decompilers.
What are you publishing to (Windows, mobile, console)?
A developer loses their original project files (hard drive crash, no backup) but still has the compiled .exe . They desperately want to recover their work. This is rarely successful 100%, but partial recovery is possible.