Demon’s Souls: Black Phantom: RPCS3 Booting failed The selected file or folder is invalid. Error Fix

Guide for Setting up Demon Souls on a PS3 Emulator
Demons Souls is Now 100% Playable on PC!
As of a few days ago, the PS3 emulator RPCS3 has been updated to grant a massive performance boost to Demons Souls, finally allowing general users to play demon souls on PC with actually playable stability. This will be a comprehensive-ish guide for all users.

There are no hard requirements for running the game but a decent CPU is required (late i5 equivalent or better) to be able to play without stuttering and with maximum stability.

Before you get started, you do of course need a copy of Demon Souls or at the very least the game files. I don't condone piracy and won't be providing any links for Demons Souls ISOs but if you already have a copy of the game and would rather download the files online rather than ripping them yourself you will be able to find them very easily. I recommend you extract the game files from the .iso on an external or secondary drive as it's a decent size (8.13GB) and keeping it on an SSD wont help much with performance.
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