The size of a tile whose CurrentSize property is set to 'Small' is determined by the value of this property.
To ensure that the edges of all tiles align evenly, all tile sizes are based on this value. 'Medium' tiles occupy the same amount of space as a 2 x 2 grid of four small tiles. 'Wide' tiles occupy the same amount of space as a 2 x 1 grid of medium tiles, and 'Large' tiles occupy the same amount of space as a 2 x 2 grid of medium tiles.
The value of the TileSpacing property also affects the size of medium, wide, and large tiles.
When not explicitly set, this property resolves to a value that is ideal for the local machine's current resolution scale.
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