: If your computer asks if you're sure you want to change the extension, click Yes .
: Ensure "File name extensions" is enabled in your system settings (View tab in File Explorer on Windows) so you can see and edit the extension. Confirm the change convert zip to sb3 updated
: On Windows, ensure "File name extensions" is checked in the View tab of File Explorer, otherwise you might end up with a file named project.sb3.zip . : If your computer asks if you're sure
: Can extract assets and JSON from packaged files back into a format compatible with Scratch. Technical Structure of an SB3 File convert zip to sb3 updated
Ensure you didn't accidentally rename or delete the project.json file while editing.