Instead of constantly bumping your threads have you considered the search function?
There is something for vB3 that does prefixes. I can't recall it's name but I'm sure if you go to
www.vbulletin.org/forum/search.php and search for prefix in the vB3 forums then it will turn up.
Generally speaking though if you haven't got an answer in the first 24 hours of making a post then there is no answer to it or you should be searching.