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- Extract the raw actionscript blob from the gpk. Use this tool repacker https://github.com/GoneUp/GPK_RePack
- Open the extracted raw blob with Free Flash Decompiler https://www.free-decompiler.com/flash/
- Go to "DoAction" script
- click on "edit P-code"
- Do your edit
- Save
- Save as XXX.gfx
- Go back to GPK repacker tools
- Big ByteProp Import -> select the newly created .gfx file
- Main -> Save
