The file you are referring to, SNES-NSO-(USA)-NSwTcH-NSP-Update340-Ziperto.rar , is a package for the (SNES-NSO) app on the Nintendo Switch. This specific update (v3.4.0) introduced several features to the classic game library: Key Features in Update 3.4.0
: The file extension .NSP (Nintendo Submission Package) indicates a digital game format typically used for installing software on a Nintendo Switch system. Sources like Ziperto often host these files for use on consoles with custom firmware. SNES-NSO-(USA)-NSwTcH-NSP-Update340-Ziperto.rar
: Play classic co-op or competitive games with friends online, including a "virtual pass the controller" feature. : Play classic co-op or competitive games with
: An updated CRT filter is available to give the games a more authentic retro look on the Switch screen. Standard App Features The file you are referring to
The core SNES-NSO application provides the following persistent features:
: You can now rebind and save unique control schemes for each individual game in the library.
Super Nintendo Entertainment System™ - Nintendo Switch Online