She uploaded the updated SB3 to the community repository with a short changelog: “Converted from legacy ZIP; updated assets; fixed custom opcodes; notes included for edge cases.” Comments trickled in — thanks, questions, and one message that made Mira’s eyes sting: “My kids loved this. Thank you for fixing it.”

When prompted to keep .zip or use .sb3 , select Use .sb3 . Method 2: Using Online Conversion Tools

To extract the contents of an SB3 file:

If you downloaded a Scratch project from a source that automatically zipped it, or if you previously changed an SB3 file to a ZIP file, you can convert it back just by changing the file extension. On Windows: Open and find your ZIP file. Click the View tab at the top menu.

Open the folder containing your project assets ( project.json , costumes, sounds).

When converting ZIP files to SB3, make sure to:

Because an SB3 file uses the PKZip compression algorithm, a "conversion" from ZIP to SB3 is often less about changing data and more about . The Manual Conversion Process

Search for a reputable online archive converter like CloudConvert or Zamzar. Upload your .zip archive.

Ensure you didn't accidentally rename or delete the project.json file while editing.