"Mise à jour" is French for update , indicating this file specifically contains the version 1.0.1 patch for a Just Dance title.
This is an early version patch typically released shortly after a game's launch to fix day-one bugs. Just Dance (NSP)(Mise Г jour 1.0.1).rar
NSP files are designed for installation on modded Nintendo Switch consoles using custom firmware (CFW) such as Atmosphere . "Mise à jour" is French for update ,