Turn on "File name extensions" in your OS settings to ensure you aren't double-tagging the file.
Delete .zip at the end of the filename and type .sb3 . convert zip to sb3 fix
Go to the Scratch Editor , click File > Load from your computer , and select your new file. Method 2: Manual Re-Zipping (The "Broken Archive" Fix) Turn on "File name extensions" in your OS
Right-click the highlighted files and select Compress to ZIP file (Windows 11) or Send to > Compressed (zipped) folder (Windows 10). convert zip to sb3 fix
Re-zip files from the inside of the folder, not the folder itself. Ensure the project.json file is present and not corrupted. File stays a ZIP