The .rar is a container; the internal .nsp is the standard digital format used for Nintendo Switch games and emulators.
A common safety practice is to test the file first in an emulator like Ryujinx on a PC before installing it on an actual Switch. Installation Context Sea of Stars (NSP)(DEMO).rar
A report for the file indicates it is a compressed archive containing a Nintendo Submission Package (NSP) for the demo of the turn-based RPG Sea of Stars . File Details Game: Sea of Stars (Demo version). File Details Game: Sea of Stars (Demo version)
The demo on the official Nintendo eShop is approximately 1 GB . If your .rar or extracted .nsp is significantly smaller (e.g., only a few MBs), it may be incomplete or malicious. Safety & Legitimacy Safety & Legitimacy You can use tools like
You can use tools like NSC_Builder (Nintendo Switch Cleaner and Builder) to verify the file's hash and digital signature against known legitimate copies.
Files obtained from unofficial sources ("the high seas") carry inherent risks of malware or "brick code" that can disable a modified console, though this is rare for well-known titles.