The format is a "bundled" format specifically designed for the Cemu emulator. Unlike older formats that required separate folders for the game, updates, and DLC, the .wua file compresses everything into a single file .
Suddenly, the graphics began to warp. The sky turned a deep, bruised purple. The ground beneath Leo’s feet began to delete itself—not the blocks disappearing, but the chunks themselves. The world was falling away into the void. minecraft wii u rom wua