On my system, exo-open is generating strange URLs.  For example:

exo-open http://www.google.com
works fine

exo-open --working-directory foo http://www.google.com
works fine too

exo-open --launch WebBrowser http://www.google.com
opens the browser with
file:///usr/home/rick/'http://www.google.com'

exo-open --working-directory foo --launch WebBrowser http://www.google.com
opens the browser with
file:///usr/home/rick/foo/'http://www.google.com'

Thunar -> Help -> Contents
opens the browser with
file:///usr/home/rick/'file:///usr/local/share/doc/Thunar/html//C/index.html'

The URL is put in single quotes and prefixed with the working directory whenever the --launch WebBrowser option is used.  Is there something wrong with my set-up, or should I submit a bug report?

FreeBSD 7.2-RELEASE
xorg-7.4_2
xfce-4.6.1
libexo-0.3.101