Botw Rom File ((exclusive)) -

The only legal way to obtain a ROM file is to of the game. Using "abandonware" or pirate sites carries significant risks, including malware and legal notices from ISPs. For Wii U (Cemu):

In Cemu, enable "Graphic Packs" to unlock the frame rate and fix shadows or reflections. A Note on Legality botw rom file

A "ROM" (Read-Only Memory) or "ISO" file is a digital copy of a game’s data. For The Legend of Zelda: Breath of the Wild , there are two primary versions: The only legal way to obtain a ROM file is to of the game

Generally preferred for PC emulation because the Wii U emulator, Cemu , is highly optimized. A Note on Legality A "ROM" (Read-Only Memory)

The most common method is using a tool called on a homebrewed Wii U console. This creates a "loadiine" folder or a compressed file that Cemu can read directly. For Nintendo Switch:

A base ROM is often version 1.0. You must dump your update files and DLC folders separately to access all content and ensure stability.