This method works because the Scratch Offline Editor checks the file’s internal structure (the magic bytes and the presence of project.json ) rather than relying solely on the file name.
If you are looking to convert Scratch projects between formats (like HTML or EXE), specialized tools are recommended: TurboWarp Packager convert zip to sb3 updated
To convert a ZIP file to SB3, follow these steps: This method works because the Scratch Offline Editor
Select all the files inside your project folder (the json, the images, and the sounds). Right-click and choose Send to > Compressed (zipped) folder . convert zip to sb3 updated