Built-in microwave oven page on the manufacturer’s site http://www.electrolux.ru/Products/%D0%9F%D1%80%D0%B8%D0%B3%D0%BE%D1%82%D0%BE%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5_%D0%BF%D0%B8%D1%89%D0%B8/%D0%9C%D0%B8%D0%BA%D1%80%D0%BE%D0%B2%D0%BE%D0%BB%D0%BD%D0%BE%D0%B2%D1%8B%D0%B5_%D0%BF%D0%B5%D1%87%D0%B8/Built-In/EMT25207OX/  FBX did not want to export the material attached separately multisubmaterial. Simply apply it to the model materials assigned automatically.