Dave Sigafoos:
2) We have tried adding file:// to the accepted list, and this almost
works. It shows correctly as a link (as long as I %20 all the
spaces).
But the link doesn't do anything.
This is an FAQ; see:
http://meta.wikimedia.org/wiki/MediaWiki_FAQ
and look for "Is it somehow possible to use a "file"
URI-qualifier...".
This is a tricky thing to fix, as many browsers will ignore these links
anyway; your best bet is to place the files somewhere the web server (or
some web server) can see them, and then use http: links rather than
file: links.
Ian