html export is broken for images

The html export contains broken image links.

See the following live example
source: https://www.computer42.org/xwiki/bin/view/DevNotes/
export: http://www.computer42.org/xwiki-static/exported/DevNotes/

In export the image link is:
<img src="file://attachment/xwiki.DevNotes.WebHome.tools-64.png" alt="tools-64.png">
The associated file is exported to DevNotes/attachment/xwiki.DevNotes.WebHome.tools-64.png