To get the usable .nsp file from that archive, follow these steps:
: Ensure you have downloaded every part of the set (Part 1, Part 2, etc.) into the same folder on your computer. If even one part is missing, the extraction will fail. Use a Compatible Tool : Use a program like 7-Zip or WinRAR .
It looks like you're dealing with a specific split-archive file for on the Nintendo Switch, likely sourced from a third-party site. This guide explains how to handle "Part 2" of a multi-part RAR archive to get your game ready. Understanding Multi-Part Archives