If your browser fails to play the .wma files on this page
check here for a list of plugins that you presently have installed.

You will need to reinstall your media player if it fails to appear after clicking the links.
Most likely cause for this is the fact that the Windows Media Player was installed before installing the Netscape browser that you are presently using.

Lists installed Plugins.
Lists installed Plugins + descriptions.
Lists installed Plugins + associated "DLL" files