Microsoft has released a new build of Windows Media Player 9 - 22.214.171.12414.
When the Windows Media Player 9 Series starts, it updates the radio preset list from the Internet. In certain enterprise scenarios, the network administrator may want to restrict this behavior.
A new Group Policy object permits an administrator to prevent the Windows Media Player 9 Series from accessing the Internet to retrieve this information.
Download: WMP9 update
View: MS knowledge base article