A WAD file is a container file format used by the Wii to distribute and install software. WAD files can contain a variety of data, including channels (like the Internet Channel), updates, and patches. Official WAD files are typically signed by Nintendo to ensure their authenticity and integrity. However, the homebrew community has also made extensive use of WAD files to distribute custom applications and modifications.
If a game doesn't match your TV's signal, you can force it to NTSC or PAL60 to prevent "rolling" screens or black-and-white images.
To use the NeoGamma R9 "WAD" (a channel file that puts the app directly on your Wii Menu), follow these steps: