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CLEO is an extensible plugin for the Grand Theft Auto games series. Using CLEO it's possible to add custom scripts written with Sanny Builder or another script editor to the game without starting a new game. Adding and removing a script is as easy as copying and deleting a file in the CLEO folder. CLEO 4 adds 100 useful scripting commands (opcodes) that make possible to work with external files, to change the game memory, to call exe functions with custom parameters, and much more.