I am having a problem with nautilus on my Ubuntu 12.04 system with Gnome classic. It has lost all associations for things like network://, file:///, computer://, etc. So using google, yahoo, or bing search engines and specifying "network://" (including quotes), I get everything on the planet that has the work network in it. I have used the advanced options for all of them and the verbatim option in google, and they just won't limit the search to what I want.