Create a prototype shortcut ( It creates one by default but if you erased it or whatever, go into the program files/activision/prototype, right click on prototypef and create a shortcut). After you create it, right click the shortcut and click properties. There should be a directory path called ”Target” and it should have something like this: “C:\Program Files\Activision\Prototype\prototypef.exe”
So now you write windowed behind it so it will be like( write just windowed not -windowed
“C:\Program Files\Activision\Prototype\prototypef.exe” windowed
Now you can go into the game and change the resolution. I set mine as low as I can and when I started the game, it gave the Input not supported for a sec but then the game booted up nicely.