For Steam deck users trying to edit the save, try doing this. search /home/deck/.wine/ and open user.reg text file. Search for the "[Software\\DefaultCompany\\Jubakusennou] 1677605743" part and simply copy and paste the content of the save file to the registrySave location : Computer\HKEY_CURRENT_USER\SOFTWARE\DefaultCompany\Jubakusennou
Here is my full save
To use the file, just double click it that's all you need to do