(USA) - The content is for the North American region. Platform: NSwTcH - Nintendo Switch.
.Zip - The file is compressed, needing to be unzipped to access the .nsp file. KARDBRDKCSHPSIM-(USA)-NSwTcH-NSP-Update1316-Zip...
a legitimately owned game update on a modified Switch Finding a specific update for a game you own Extracting a .zip file on a specific operating system (USA) - The content is for the North American region
.NSP - Nintendo Submission Package (the standard format for installing games/updates on a modded Switch). KARDBRDKCSHPSIM-(USA)-NSwTcH-NSP-Update1316-Zip...
"KARDBRDKCSHPSIM" appears to be a compressed or scrambled title for a game.
Distributing, downloading, or using game files (NSPs) that you do not own is generally illegal and against the terms of service of the Nintendo Switch. If you are asking about: