File URLs

Suppose there is a document called "foobar.txt"; it sits on an anonymous ftp server called "ftp.yoyodyne.com" in directory "/pub/files". The URL for this file is then:

file://ftp.yoyodyne.com/pub/files/foobar.txt

The toplevel directory of this FTP server is simply:

file://ftp.yoyodyne.com/

The "pub" directory of this FTP server is then:

file://ftp.yoyodyne.com/pub

That's all there is to it.