desktop filebrowser

Hello Matchbox users,

I am using matchbox on a jornada 720 with debian sarge. Everything  
works really well. I would like to know how to get filebrowser  
folders on matchbox-desktop .... I created an image.desktop file as  
in the example, and placed in ~/.matchbox/mbdesktop_filebrowser/ but  
it still doesn't appear. I have uncommented the module in  
mbdesktop_modules too.
I have set the type to Directory, so it should appear in the desktop  
root, and yet nothing...
Does anyone know where I went wrong?
Thanks,

Matthis