This file appears to be a compressed archive containing for a specific game, likely distributed via Ziperto. Breakdown of the Filename:
: Always ensure you have the base game installed before adding DLC, as the DLC will not work on its own. MFLD-NSwTcH-NSP-[5DLCPack]-Ziperto.rar
: Use a utility like WinRAR or 7-Zip to unpack the .rar file. You will typically find one or more .nsp files inside. This file appears to be a compressed archive
Be cautious when downloading from ROM sites, as they often use link shorteners that may trigger antivirus warnings. If your console or emulator (like Ryujinx) fails to recognize the files, ensure your "prod.keys" and firmware are updated to the latest version. MFLD-NSwTcH-NSP-[5DLCPack]-Ziperto.rar
: You will need a modded Nintendo Switch running Custom Firmware (CFW) like Atmosphere.