I think a file type filter would be useful on the search results anyway. If you're always going to get spam at least you only have to look at spam of the right file type and you wouldn't have to worry about a .vbs at all. All search results would still come back to the client it would just only display the ones of the specified type. It would just be another one of the sorting type options that you could toggle on and off and would have nothing to do with the query sent or the protocol.