Hi Matt,
Easily manage your favicon for desktop, touch icon for mobile devices, and tile icon for the Windows 8 Metro interface in this section. If an image is not set, nothing will be output for that particular icon type. When setting the path to your favicon, make sure you are using the “.ico” format. A 152×152 PNG should be used for your touch icon, and a 144×144 PNG should be used for your tile icon. The color you set for your tile icon will be used behind your image.
Hope that helps
Joao