Rt-f2-nswtch-[base]-nsp-(eshop)-ziperto.part1.rar -
: This is the name of a well-known website that hosts pirated console games.
: Indicates this is the core game file, not an update (UPD) or downloadable content (DLC).
: Because the game is large, it has been split into multiple compressed "parts." You would need all parts (part2, part3, etc.) to extract the full game.
In short, it's the digital footprint of someone sharing a copy of a beat-'em-up game online.