Steam & Guide Button

In order to use the Guide button in Windows and to prevent Steam Big Picture from starting up, you have to take some additional steps.

Prevent Windows Game Bar from starting up

In Windows: go to Start > Settings > Gaming > Game Bar and turn off everything there.

Prevent Steam Big Picture from starting up

Download the file below, this will filter out Guide button presses when you have steam running.

This file is just a simple DLL file which you have to place in your steam folder

Default location: 'C:\Program Files (x86)\Steam'

Download here