Unlike engines that compile scripts directly into machine code or assembly, Clickteam Fusion packs assets (such as sound effects, active objects, and textures) and strings data into an encrypted runtime block. The compiled .exe behaves as a runner executing an event sheet.
This is where it gets tricky. The standard " Chunli" decompiler (a well-known tool in the community) was the go-to for Fusion 2.0 games. It attempts to convert the bytecode back into the event list editor format. clickteam fusion decompiler