Most people just wanted to play bowling. Elias was different. He was a digital archaeologist, a hoarder of code. He didn't want the experience; he wanted the files. He wanted to see how the game ticked, to strip it down to its bare skeleton and see how the physics engine handled the weight of a virtual bowling ball.
When discussing "NSP" and "XCI," you are referring to the two primary ways Nintendo Switch software is packaged for the console's file system.
