If you have legally obtained this file and intend to use it for emulation or on a modded console:
The standard file format for Nintendo Switch digital games/packages. PM-MOD-RT-RF-NSwTcH-NSP-Ziperto.rar
Likely refers to Paper Mario: The Thousand-Year Door (specifically the 2024 Nintendo Switch remake). If you have legally obtained this file and
Use a tool like 7-Zip or WinRAR to extract the .nsp file from the archive. PM-MOD-RT-RF-NSwTcH-NSP-Ziperto.rar
If the "MOD" tag refers to a specific cheat or graphical tweak, it may require a separate folder (usually placed in /atmosphere/contents/ on your SD card).