If I'm right, the format you've got is either .rar or .zip.
That means they're compressed archives containing the save files, so you need to extract them from their compressed state.
Download and install either 7zip or Winrar (I recommend 7zip to avoid later annoyance) and then extract the files from the archive (.rar/.zip file) then put the extracted files in the game's save directory - Make a save in the game at least once to generate the save folder first, which will be in the same folder named game that you put the Mandatory Patch in.
C'mon dude, I obviously extracted the file.
The problem here is that the extracted files come separate in their folder, a json file, signatures, RenPy version and the screenshot png of the save moment.
While the saves in the game are only in the ".save" single file.
I don't know if, at this point, is a problem with the way I'm extracting or JoiPlay that I'm using.