: Stands for Nintendo Submission Package . This is a file format used for digital titles on the Nintendo Switch eShop.
: Indicates this is the "base" version of the game without any subsequent updates or patches. JustDance2021v0NSP-xcinspdotcom.part1.rar
To actually use this file, you cannot simply open "Part 1." You must have (e.g., part1, part2, part3, etc.) in the same folder on your computer. : Stands for Nintendo Submission Package