It's a bug in the un-maintained eclipse-update-site packaging type we're using to aggregate repositories. Those file:// ids are used to create unique identifiers for categories. Implementation in eclipse-repository packaging type is better and removes that, but we can't use it yet because we have some tweaks relying on the site.xml file.I was having 'fun' with Igor F. p2 browser and noticed that our sites have references to file:// based repos. See: http://screencast.com/t/n9y3c0uS This is showing for 3.3.x builds but I just tested on http://download.jboss.org/jbosstools/updates/stable/juno/ and its the same in here. Any idea why that is in there ?