The "proper piece" you are looking for—specifically how to use this file—generally involves installing it on a modded console. File Tag Breakdown
: The game title, "One More Island," a colony management simulator. USA : The region for which the game was released. NSwTcH : Shorthand for Nintendo Switch. ONEMORISLND-(USA)-NSwTcH-[BASE]-NSP-Ziperto.rar
To use an NSP file on a Nintendo Switch, you must have a console running custom firmware (like Atmosphere). Common tools used to install these files from an SD card include: The "proper piece" you are looking for—specifically how
: A highly efficient installer often preferred for its "MTP Responder" mode, which lets you drag and drop files directly from your PC to the Switch. NSwTcH : Shorthand for Nintendo Switch
: The file format (Nintendo Submission Package), which is the standard format for digital Switch games.
: A feature-rich installer that supports "shops" and network installations.
Modifying your console or using files from third-party sites like Ziperto carries risks, including a potential ban from Nintendo's online services and the risk of malware. Always ensure you are following safe practices within the homebrew community.