The NSP (Nintendo Switch Package) file is a format used for Switch game backups. NSP files are used by CFW users or for testing and developmental purposes. NSP files contain the Switch game data and can install through a CFW switch. Please be aware that downloading NSP files for game backup can be a convenient option, it should only be done if you own the game.
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These measures underscore a clear message: the era of "free" pirated games is ending, and the risks for users are higher than ever. The NSP (Nintendo Switch Package) file is a