When a game is "compiled," it is transformed from human-readable GML (GameMaker Language) code into machine code that the computer can run, while removing comments and some formatting. A decompiler tries to reverse this process, attempting to reconstruct: Where to Find a Working GameMaker 8 Decompiler Link
The most famous and widely used tool specifically built for this era of the engine is simply known as the , often associated with a developer named Lizard. Target Engine: GameMaker 8.0 and GameMaker 8.1. gamemaker 8 decompiler link
It separates the standard GameMaker 8 runner from the appended game data. When a game is "compiled," it is transformed