This normally would happen because you have somehow made Realplayer your default player, or Limewire thinks for some reason that it is. I suggest you ignore the icons and rather enable the search window to show "type". To do this you may need to right click on the title bar of the search window and put a tick against type.
I believe you can get rid of the problem by deleting your Limewire preference folder whilst Limewire is fully closed, but this will mean you will have to reconfigure and may lose some older incompleted files.
Let us know if this helps
