Regarding all the uri:// or what ever they are called. Where are they created?

[Kent Nyberg <blurk telia com>]

I was playing around today and wanted to make my own "whatever://" that
nautilus can understand.
But i do not get it, where are these created? gnome-vfs?
I did some google'ing bout found nothing of interest.

If some one could send me some information, a link to where this is
explained more, or something, then i would be very happy.

Have a nice day!