The file is a system file for the Nintendo Wii Go to product viewer dialog for this item.

If your Wii is already softmodded, you can use apps like to install the WAD from your SD card. This is usually done to fix "black screen" errors when a specific game refuses to load. A Word of Caution: Avoid Bricking

: The filename could also represent a software update or patch for an application running on iOS 56 (which might be a mislabeling since iOS versions are typically denoted with two digits, e.g., iOS 15) on 64-bit devices, with the version being 5661.