This is the standard file format for Nintendo Switch digital eShop games.
Fashion Police Squad is a humorous retro-styled first-person shooter where you play as Officer Des, a member of the elite squad tasked with fighting "fashion crimes." Instead of lethal weapons, you use tools like the sewing machine gun or the Belt of Justice to fix baggy suits and neon-clashing outfits. Fashion Police Squad (NSP)(eShop).rar
Files hosted on unofficial blogs as .rar archives often contain "double extensions" (e.g., .nsp.exe ) that can infect your computer. This is the standard file format for Nintendo