Open the file in a reader of texts, such as Notepad. Generally you find the key to every game in a file *.NFO in the downloaded game files. The real Wii U Common Key you can find on the Internet. In keys.txt file you must add the Wii U Common Key and the keys of the games # Wii U Common Key # Key to a game # Key to a game 2. You will need to have Microsoft Visual C X64 Redistributable installed to run the emulator.
Check out news about the emulator in the release announcement and do the download here. It was released a Wii U emulator, the Cemu.
