In search results, click the tab to the far top-right of window to show in Classic View. Then right-click column-heading bar & choose to show extensions. That should show whether the file is wma or wmv. You can also filter out wma/wmv files via settings.
http://www.gnutellaforums.com/new-fe...tml#post338459 - Classic view is similar to LW's 4 viewing.