He dragged his first 7z file into the left panel. Mario Kart Wii.7z . 1.2 GB compressed.
is the best graphical interface for the WIT (Wii Intelligent Toolset) to handle these conversions. Option C: WBFS Manager 7z to wbfs converter
Some popular tools that can convert 7z to WBFS include: He dragged his first 7z file into the left panel