WAD (acronym for "Where's All the Data?") is the standard file format used for Wii system software, channels, and games. In the context of the vWii:
While the vWii behaves similarly to an original Wii, its architecture is integrated into the Wii U hardware. This creates a higher risk profile for WAD installation: vwii wad
The manager unpacks the WAD and writes the contents to the vWii's internal flash memory. WAD (acronym for "Where's All the Data