Miitopia -nsp--update 1.0.3- -2-.rar
NSP files are typically associated with Nintendo Switch game files, not the 3DS. However, it seems there might be some confusion or a mix-up in the file extension you're referring to. For the 3DS, game files are usually distributed as .cia or .3ds files.
The "Miitopia -NSP--Update 1.0.3- -2-.rar" file is a compressed archive that contains the update data for Miitopia. The file is specifically designed for users who want to manually update their game to version 1.0.3-2. Miitopia -NSP--Update 1.0.3- -2-.rar
If you are looking for the technical background of what this file represents: NSP files are typically associated with Nintendo Switch
: This stands for "Nintendo Submission Package." It is the standard file format used for games and updates on the Nintendo eShop. Update 1.0.3 not the 3DS. However