Note: This fork will be updated for the time being. Please test your option suggestions, or ask a friend with the right hardware to do so, using the Reference.xml.
Original README body:
This tool is used for modifying game profiles inside the internal driver database of the nvidia driver. All game profiles are provided by the nvidia driver, but you can add your own profiles for games missing in the driver database. You also have access to hidden and undocumented settings, which are not provided by the drivers control panel.
For more information how to use this tool, you can find some very good wikis here: