The WM/ProviderRating attribute is the rating of the item assigned by the provider of the attribute values.
This attribute is stored in both the library (or cache) and the digital media file.
Rating is an alias for this attribute.
The Windows Media Format SDK constant for this attribute is g_wszWMProviderRating.
To determine whether you can change the value of this attribute, use the Media.isReadOnlyItem method.
||Windows Media Player 9 Series or later