Right-click and select "Extract Here" using a program like WinRAR or 7-Zip .
Ziperto (A well-known site for hosting console game backups/ROMs). Archive Type: Part 2 of a multi-part RAR archive. How to Use This File JD2021-NSwTcH-[BASE]-NSP-(eShop)-Ziperto.part2.rar
NSP (Nintendo Submission Package), which is the standard format for digital Switch games. Right-click and select "Extract Here" using a program