inside the folder – not the folder itself . Use Ctrl+A (Windows/Linux) or Cmd+A (Mac).
: Scratch does not store assets by their human-readable names (like cat.png ). Instead, it renames them using an MD5 hash—a unique string of characters based on the file content (e.g., 83c25d51718e82d7ff1b192181cf26b6.svg ).
Windows will show a warning: "If you change a file name extension, the file might become unusable." Click to confirm. Method 2: macOS (No Software Required)
Standard compression is used, identical to the ZIP standard. ⚠️ Common Troubleshooting
The file extension is the standard format for Scratch 3.0 projects. Structurally, an .sb3 file is actually a renamed ZIP archive containing the project’s assets (images and sounds) and a project.json file that defines the code.