Specifically, this file is a for the game River City Girls 2 .
: Signifies the source was the digital Nintendo eShop rather than a physical game cartridge. RT-F2-NSwTcH-[BASE]-NSP-(eShop)-Ziperto.part1.rar
: The file format used for digital Nintendo Switch games (Nintendo Submission Package). Specifically, this file is a for the game River City Girls 2
: 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. RT-F2-NSwTcH-[BASE]-NSP-(eShop)-Ziperto.part1.rar
In short, it's the digital footprint of someone sharing a copy of a beat-'em-up game online.
: Indicates this is the core game file, not an update (UPD) or downloadable content (DLC).
: This is the name of a well-known website that hosts pirated console games.