This property overrides the TextSize property.
In most cases, a tile's content can be customized sufficiently using one of the four fonts available to the template-based content types. In cases where additional flexibility is required, set the UseAppearanceFontSize property to true, and set the font size on the element's Appearance.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2