: Added Petey Piranha , Wiggler , and Kamek as playable racers.
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
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: : Added Petey Piranha , Wiggler , and
: Added eight tracks, including the new Squeaky Clean Sprint and returning classics like Wii Koopa Cape and GCN Daisy Cruiser . System Improvements : System Improvements : Enhanced the performance of certain
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
: 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.