The ability of files to do that has been stopped with LW 4.12.3 so get it here: http://www.limewire.com/english/content/download.shtml
However those fake file results will still show up. To get rid of them, you can try adding to your keyword filter such as described here: Sponsored Results (click on link)
Those such files will usually show up with 100's of results such as 100 for one, 99 for the next, etc. We recommend going for files that have 10 or 20 or so results.