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The legally supported way to acquire these files is to perform a :
This is the format Nintendo uses for digital downloads from the Nintendo eShop . It acts like an installer (similar to an .exe on Windows) and must be "installed" to your console's storage or SD card to be played.
In the context of Nintendo Switch gaming, these terms refer to digital game backups (ROMs) used on modded consoles or emulators like Ryujinx and Yuzu.