Open UndertaleModTool.exe . Go to and navigate to your compiled game's folder. You are looking for a file named data.win . In some exports, this might be embedded in the .exe , but for most GMS2 games, it sits in the same directory. 2. Browse the Assets
For a game with 100 objects, this takes 10+ hours. game maker studio 2 decompiler free install
The standard for modern GameMaker games (GMS1.4 and GMS2). It can read and edit code directly from the file. You can download it for free from the UndertaleModTool GitHub GMSD (GameMaker Studio Decompiler): Open UndertaleModTool