: If you right-click a folder containing your project and zip it, the zip file creates a top-level directory. Scratch expects project.json to be at the immediate root of the archive, not inside a subfolder.

Converting a file to an (Scratch 3.0) file is a common "fix" used when a Scratch project has been corrupted or needs to be manually edited. An file is essentially a renamed archive containing a project.json file along with various image and sound assets. Why Convert ZIP to SB3? This process is often used as a "fix" to: Recover Corrupted Projects

The validator will highlight missing commas, unclosed brackets, or broken quotes. Fix these errors, save the file, and re-zip the assets. Fix 2: Cleaning Out Subfolders

Here is a complete guide on how to convert ZIP to SB3 and fix the most common conversion errors. Understanding the SB3 File Structure

: Zipping the parent folder. (Creates a structure like Project.zip/MyProject/project.json )

Your project loads, but the stage is empty, or sprites have disappeared.