: Open the Scratch Editor , go to File > Load from your computer , and select your new .sb3 file. Why This is Useful Convert .zip to .sb3? - Discuss Scratch
An .sb3 file (Scratch 3.0 project) is a proprietary binary — it is a standard ZIP archive containing: Zip To Sb3 Converter
Once the ZIP is created, right-click it and rename the extension from .zip to .sb3 . : Open the Scratch Editor , go to