Based on the filename provided, this appears to be a found on Ziperto , a popular website for downloading Switch NSP/XCI files. The file indicates a specific game update ( POKLGEV likely refers to a Pokémon-related title like Pokémon Quest or similar, though often these are placeholder names), designated as a (RF) (Release Fixed or Region Free) UPDATE in .nsp format, compressed into a .rar archive.
This is a software patch for the game. It does not contain the base game itself, only the files needed to upgrade a lower version to a higher one. NSWTCH: Indicates it is for the Nintendo Switch console.
Sometimes updates are required to use new DLC content. POKLGEV-(RF)-UPDATE-NSWTCH-NSP-ZIPERTO.rar
Unlocking Nintendo Switch Games: OSC, Emulators, And NSP Files - Ftp
NSP files are typically used for homebrew-enabled or modified consoles (running SX OS or Atmosphere) to install updates from unofficial sources. How to Use (Context: Modified Switch) Based on the filename provided, this appears to
A Nintendo Submission Package. This is the digital format of a switch game, similar to a digital cartridge or eShop file.
Likely short for a game title, potentially PokéLand Legends or a similarly named title, frequently seen in Ziperto's NSP listings. It does not contain the base game itself,
Means this update will work on a Switch console regardless of its region (e.g., US, Europe, Japan).