Dev Mode is necessary for playing emulators on Xbox One. You have to own a developer account for Dev Mode activation. Microsoft is currently offering us a great opportunity to grab a developer account free of charge. It’s offered through Windows Dev Essentials where you could get a promo code to redeem the fees charged when you register a developer account. This is not for ever I guess, so hurry up to make use of it and save $19 for playing emulators on Xbox One.