Click Set defaults by app to open the Set Default Programs Control Panel window. Find the program you want to use and click it to select it.

If you download a Game Ready Driver from Nvidia and discover you now have to get the Nvidia Control Panel from Microsoft, don't worry. There's still a way to get a standard driver with the NVCP ...

If you want to optimize NVIDIA Control Panel for the best Gaming performance on your PC, open its 3D Settings and make these changes.