The file is compressed, requiring extraction before it can be used, often used to bypass file-sharing site limitations or to keep files together.
Sharing and installing .nsp files is a form of piracy, which infringes on intellectual property rights. Zombie Survival [0100F84019C2E000][v0][US].nsp.rar
The distribution and usage of .nsp files, such as the one described, exist entirely outside the authorized Nintendo eShop ecosystem. The file is compressed, requiring extraction before it