How do I open the PlayerController?

“I am taking the previously mentioned advice of not editing it, but for the record if you go to your game mode, it will show the default playercontroller as it’s player controller. Next to it is a magnifying glass that will take you to it’s location, which turns out to be in the EngineC++ directory.”

Does this not work anymore? I was following a video and they were able to do as you said here but for me it does not open.