Parsing error: Invalid EXE header about gm8decompiler HOT 1 CLOSED

Since this game is a paid download I can't verify for myself, but there are only two cases which would create an InvalidExeHeader error: the file you're trying to decompile either is not a valid .exe file, or is not i386 architecture.

(Relevant code: https://github.com/OpenGMK/OpenGMK/blob/ebaa4d125758f6f65ff0deebbd4ab3fd5e817314/gm8exe/src/reader.rs#L79-L91 )

I did some searching on this game to try to find out its engine. Steam's metadata lists the engine as just "GameMaker", but a fan wiki claims the engine is GameMaker Studio 2. This project only targets the classic GameMaker versions before Studio, so it sounds like you need to look for a GameMaker Studio 2 decompiler. I think UndertaleModTool would be your best shot. Best of luck.

from gm8decompiler.