El tema del Atmos sigue en pruebas, parece que para la actualización gorda de primavera (a ver si es verdad), un fragmento de información de la próxima actualización para los del "Program Insider":

• Settings - Display & sound
The Audio output page is under construction and some of the new settings are not yet functional. New support is planned for Dolby Atmos for home theater, Dolby Atmos for headphones, and more in upcoming builds. An announcement will be made when these new features are ready to try out; enabling these settings now will have no effect.