The file you referenced is a compressed archive containing a Nintendo Switch update for . The filename identifies it as an NSP (Nintendo Submission Package) file, which is a standard format for digital Switch software, updates, and DLC.
If you are using a PC emulator like or Yuzu , follow these steps: DEMSLAY-KNY-THC-NSwTcH-NSP-Update101-Ziperto.rar
Go to File > Install Files to NAND and select your extracted update file. The file you referenced is a compressed archive