The file must be named exactly prod.keys . Not prod.keys.txt , not Prod.keys . Ensure Windows file extensions are visible.
: Enabling the emulator to decrypt and read game data (ROMs) from the Switch. System Integrity Ryujinx Prod Keys v18.0.0 - Latest Product keys...
In simple terms, Prod Keys are cryptographic master keys extracted from a physical Nintendo Switch console. The Ryujinx emulator is a legal, open-source project written from scratch. However, because it does not contain any Nintendo proprietary code, it cannot decrypt game cartridges (XCI) or digital downloads (NSP) without these keys. The file must be named exactly prod