It sounds like you’re referring to a packaged file for Pokémon Shield (NSP + update 1.3.2) in .rar format.
According to Nintendo Support , the (released May 12, 2021) included the following: Pokemon Shield -NSP--Update 1.3.2-.rar
: Use a program like WinRAR or 7-Zip to extract the .nsp file from the .rar archive. It sounds like you’re referring to a packaged
Pokémon Shield Update 1.3.2 , released on May 12, 2021 , was a focused technical patch designed to refine competitive and online gameplay mechanics. While smaller in scale compared to the massive content drops of the Crown Tundra “Understanding Pokémon Shield Updates: What 1
Resolved a bug where Pokémon icons did not display correctly during online or local wireless battles .