It is the native format read by popular Wii USB loaders like USB Loader GX and WiiFlow.

What makes Alternate Universe particularly notable is its departure from the Project M foundation that most Brawl mods rely upon. Instead of building on existing gameplay modifications, Alternate Universe implements from scratch:

What your computer uses (Windows, Mac, Linux)?

: A standard dual-layer Brawl ISO is roughly 8 GB. The WBFS format strips out dummy data, shrinking the file size down significantly without losing any game content.