The file you mentioned refers to the base game of Just Dance 2017
Nintendo switch game has multiple NSP files : r/SwitchPirates Just Dance 2017 -NSP- -juego base-.parte 3.rar
This information provides a general overview of what "Just Dance 2017" for the Nintendo Switch entails and the context of NSP files in gaming on the console. The file you mentioned refers to the base
Large files are often split into smaller "parts" (Part 1, Part 2, etc.) to make them easier to upload or download. You cannot use Part 3 alone; you need all parts in the set to successfully extract the game. 2. How Split RAR Archives Work Just Dance 2017 is available on PS4, Xbox