Downloading and using NSP files for games you do not own is considered . While emulators themselves are legal, obtaining game files from unauthorized third-party sites carries risks, including malware or potential console bans from Nintendo's online services.

On a modded Switch, tools like Goldleaf or DBI are used to install the resulting NSP file to the console's SD card.

The specific string mentioned follows a standard naming convention for Nintendo Switch digital backups:

Because NSP files are digital packages, emulators and modded consoles require decryption keys (prod.keys) to run them. Important Legal & Safety Note

Stands for Nintendo Submission Package, the standard file format for digital games downloaded from the eShop.