Third-party file-sharing networks and untrusted download links are frequent vectors for malware. Files labeled as compressed archives (such as .rar or .zip ) can easily mask malicious executables, adware, or trojans designed to infect your computer during the extraction process. Corrupted Data and Console Bans
The method for installing the NSP file depends on what you're using to play the game: super smash bros ultimate nspupdate 1301rar link
Searching for specific file links like a Super Smash Bros. Ultimate 13.0.1 NSP update Ultimate 13
This is the standard file format used for official digital content on the Nintendo Switch ecosystem, including games, downloadable content (DLC), and software updates. downloadable content (DLC)
Always obtain game updates through official channels, such as the Nintendo eShop or directly through your console, to ensure you're getting legitimate and safe content.