Assuming you have found a reputable online converter (or are using a local script), here is the standard workflow:
it’s not a mess. It’s an unbuilt Scratch game waiting to be reborn. Zip To Sb3 Converter
Sometimes you might want to share a Scratch project in a format that doesn't require the recipient to have Scratch installed. Converting SB3 to other formats like HTML or EXE often starts by working with the underlying ZIP structure. Assuming you have found a reputable online converter
There are several scenarios where you might need to convert a ZIP file into an SB3 file: Zip To Sb3 Converter
: If you don't see ".zip" at the end of your file, you must enable file extensions in your OS settings (File Explorer "View" tab > check "File name extensions" on Windows).