You only need the official NVIDIA driver for the card to run. The rest is third-party software that can help with customization, overclocking and monitoring. The driver version isn't a file you should be able to find with windows explorer. The file itself is probably a .ini file that lives in the windows system folder, but I'm sure there's much more to it than that. I mean, you have to have registry entries as well.
GeForce experience will keep you updated on the lastest driver and tell you if you're current or not.