Valid Switch update packages explicitly end in .nsp or .xci . Never open or execute files ending in .exe , .msi , or .bat , as these indicate malicious software packages rather than game archives.
This file format is natively used for digital content downloaded from the Nintendo eShop. Base games, downloadable content (DLC), and software updates are typically compiled into NSP files. When installing an update for Balan Wonderworld , the file will almost always be in an NSP format. balan wonderworld switch rom nsp update link
This is the most important part of this guide. The terms "ROM" and "NSP" are often used in the context of video game piracy. Valid Switch update packages explicitly end in