Zip To Sb3 Extra Quality -
An .sb3 file is not a single file. It is a disguised ZIP archive. Rename any .sb3 to .zip, and you can open it to find:
cd /path/to/your/unzipped/project
zip -X -r -D -q -0 myproject.sb3 project.json costumes/ sounds/
Then rename: mv myproject.sb3 myproject.sb3 zip to sb3 extra quality
For power users, the command line guarantees extra quality because it removes GUI inconsistencies. Then rename: mv myproject
@echo off
for %%f in (*.zip) do (
mkdir temp_%%~nf
cd temp_%%~nf
"C:\Program Files\7-Zip\7z.exe" x -y ..\%%f
"C:\Program Files\7-Zip\7z.exe" a -tzip -mx0 ..\%%~nf.sb3 *
cd ..
rmdir /s /q temp_%%~nf
)
echo Done. Original ZIPs converted to SB3 with no quality loss.