If your goal is to learn how to program complex systems in GMS2, decompiling commercial games is often confusing due to the messy, optimized bytecode. Instead, utilize legitimate, free learning resources. 1. Official GameMaker Templates and Tutorials
If you accept the risks and have a legitimate reason (e.g., recovering your own lost project), here is the safest workflow:
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Older decompilers designed for GameMaker Studio 1.4 or early versions of G2 will completely crash or corrupt files when attempting to parse modern GameMaker bytecode, as the engine's runner architecture undergoes frequent updates. Trusted, Open-Source GameMaker Decompilers
