The safe and legal way to obtain is to pull it directly from Nintendo's own servers using specialized desktop tools. Method 1: Using NUSGet (Recommended)
. In the homebrew community, it is primarily used as a "base" for installing Custom IOS (cIOS) Ios38-64-v4123.wad
(custom IOS), which allows the console to run backups and homebrew software from USB drives or SD cards [5.2, 5.26]. What is IOS38-64-v4123.wad? IOS (Input/Output System): The safe and legal way to obtain is
: Never download .wad files from random file-sharing sites, as they may be corrupted and could potentially brick your Wii. Ios38-64-v4123.wad
Put together: appears to be the 4,123rd iteration of a 64-bit iOS-targeted resource package, likely tied to a commercial or prototype engine.