This is a compressed archive. It must be extracted using software like WinRAR or 7-Zip to reveal the .nsp file inside.
This file name refers to a digital update for a Nintendo Switch game, likely distributed via community repositories. Specifically, is shorthand for Nintendo Switch, "NSP" is the official file format for digital software (Nintendo Submission Package), and "Update 640" indicates this is a version patch rather than the base game. NES-NSO-(USA)-NSwTcH-NSP-Update640-Ziperto.rar
This update is for the Nintendo Entertainment System - Nintendo Switch Online application. This is the official emulator used by Nintendo to provide classic 8-bit games to NSO subscribers. This is a compressed archive