If you are running a library of hundreds of retro games on an SD card or a small SSD, every gigabyte counts.
As for the highly compressed version, it's likely that you're looking for a way to download the game at a smaller file size. However, please note that downloading copyrighted content without owning the game or purchasing it from official channels may not be legal. Mario Kart Wii Highly Compressed
Use Dolphin Emulator on PC or Android. It can read compressed .wbfs and .rvz formats directly.0;956; If you are running a library of hundreds
This report examines the practice of using highly compressed files for Mario Kart Wii Mario Kart Wii Highly Compressed