If you are looking for the "features" included in this specific RAR file, they are the official additions made by Nintendo in the v1.9.0 patch:
: The .rar extension means the file is compressed. You must extract it (using WinRAR or 7-Zip) to find the .nsp file inside, which is the actual update package used by Switch emulators (like Yuzu or Ryujinx) or hacked consoles.
Specifically, "UPDATE190" indicates this is the , which was released in July 2023 to add support for Wave 5 of the Booster Course Pass DLC. Key Features of this Update (v1.9.0) M RKB-(USA)-NSwTcH-NSP-UPDATE190-Ziperto.rar
The filename refers to a pirated update file for the game Mario Kart 8 Deluxe on the Nintendo Switch .
: Added eight tracks, including the new Squeaky Clean Sprint and returning classics like Wii Koopa Cape and GCN Daisy Cruiser . System Improvements : If you are looking for the "features" included
: Added Petey Piranha , Wiggler , and Kamek as playable racers.
: This is an update file only . It will not work unless you already have the base game ( Mario Kart 8 Deluxe ) installed in your emulator or on your system. Key Features of this Update (v1
Enhanced the performance of certain items and adjusted the invincibility time for specific characters. Added the ability to play "Custom Items" in more modes. Various bug fixes for online play stability. Important Technical Context