The file formats you mentioned ( .nsp inside a .rar archive) are commonly used for sideloading software, which carries significant risks: My Clock - ver. digital (with timer) for Nintendo Switch
This application allows you to turn your Nintendo Switch into a personalized digital clock. Its main features include: The file formats you mentioned (
You can hand-draw the numbers 0 through 9 using your finger or a stylus to create a unique clock face. You can also draw custom backgrounds and the day of the week
You can also draw custom backgrounds and the day of the week. ⚠️ Important Risks of Unofficial Files You can
It is typically available for a very low price, often around $2.00 USD . File Size: The official download is approximately 126 MB . ⚠️ Important Risks of Unofficial Files
You can purchase and download it directly from the Nintendo US Store or other regional eShops.