I want to put a file url (file://host/path/filename.pdf) that points to a file on my local network in a field of type url so when a user clicks on it in a custom object detail view, it links to the document and opens it in the same way as a normal hyperlink using the http:// protocol.  When I do this though, the text "http://" gets appended to the field and it ends up looking like (http://file://host/share/filename.pdf) which doesn't work.  How can I make this work?