sb3
There is no sb3 file option
Also add sb2 (Scratch 2 project), pmp (Penguinmod project) and sprite3 (Scratch 3 sprite)
Please consult https://www.cgsecurity.org/testdisk_doc/photorec_custom_signature.html and provide some file samples. sb2 files should be recovered as .zip
https://www.cgsecurity.org/photorec/scan.php?file=9500e62d10ca6a9bbf5ae95454017db8a09faf96c90dc0e6668a4a9c73c6ed1e
It's a zip. But it has a project.json file that could suggest that it's an sb3 file.
Can you try latest 7.3-WIP ? If it recover the sb3 correctly, I will push the commit.
idk how