Msg#: 3734364 posted 1:59 am on Aug 30, 2008 (gmt 0)
That's an odd one to see, unless those urls really exist somewhre on the web. Sometimes this kind of thing can happen with incorrect relative links on your own pages. I assume you've searched your domain for bad internal links, yes?
If so, then one possible next step would be - can you find any backlinks that point to those URLs? Does any other search engine show those odd urls as being indexed?
If your server responds with a 404 status to the request for that url, and there is no place on your site that accidentally uses that url in a link, then there's nothing for you to fix - you can safely forget about the Webmaster Tools report.