Distributing copyrighted game files (WADs, ISOs, or ROMs) is illegal. The safest and most ethical way to play is to "rip" your own physical disc using a homebrew-enabled Wii and a tool like CleanRip . Conclusion
If you are using the , you do not need a WAD file. Dolphin runs game images directly. new super mario bros wii wad file download link
A WAD file is not the full game disc. The full version of New Super Mario Bros. Wii was released on a physical disc (an ISO or WBFS file). A "WAD" for this game is almost always a Forwarder Channel —a shortcut that sits on your Wii menu and points to the full game stored on your USB loader. How to Play New Super Mario Bros. Wii Today Distributing copyrighted game files (WADs, ISOs, or ROMs)
When searching for download links, exercise extreme caution: Dolphin runs game images directly