The FileSize attribute is the size of the file in bytes.
This attribute is stored in both the library and the digital media file.
Size is an alias for this attribute.
The Windows Media Format SDK constant for this attribute is g_wszWMFileSize.
To determine whether you can change the value of this attribute, use the Media.isReadOnlyItem method.
||Windows Media Player 9 Series or later (The photo item is supported only in Windows Media Player 10 or later)