WAD Manager 1.8 is considered "solid" for its historical reliability, but it lacks the safety checks found in newer tools.
Install WADs directly from an SD card or USB storage device . Wad Manager 1.8
In the homebrew context, custom WADs can contain: WAD Manager 1
If you are someone who prefers the original hardware experience and likes to install WiiWare titles directly to the internal NAND rather than running them off a USB drive, the Wad Manager format is still the way to do it. Wad Manager 1.8