I've gotten some sound files in the file of .FSB, a common Wii sound file from my knowledge. But I can't seem to find the right program to properly extracted them. Most of the time, the files would be invalided, or just make static noises.
Have you tried FSB Extractor? (I used it on Ducktales Remastered and it worked like a charm).
If not, type it in Google, click on the top link, download it, then extract it using WinRAR or 7-zip, and finally run the program and the rest will be easy to figure out.
P.S. When you make a new thread, please be sure that you make it in the right Resource topic.