Using localstorage win32 application

I have two games. Both of them have “best score” value. I have this code:
var bestScore = cc.sys.localStorage.getItem("best_score");

I use this code for two games. If I launch games on Android devices then seems all is fine. Nevertheless If I launch games on Windows (win32 application) then I have one bestScore for two games. It’s a little problem for debugging.

Are there a way to fix this?