Do not download executables (.exe). Look for .bin or compressed .zip / .rar files from known communities:
Yes, with a caveat. The Wii U’s virtual Wii mode uses the same file structure. Insert an SD card into the front slot, follow the same steps, and access → Data Management within vWii. However, note that some vWii saves require a different signature; the Homebrew method is more reliable on Wii U. wwe 13 save data wii install