Email urls opened as local Files

[Blue Raccoon]

Newbie question:

When I open a link ( www.somewwhere.com ) in a Kmail message a small dialog 
pops up (that does something very fast - I can't see what) and then the page 
is opened as a local file (e.g.  file:///var/tmp/kdecache-jayes/krun/943.0.).

The page is text only and none of the hyperlinks in it work (obviously because 
it's context has changed when it was moved to my pc).

Any idea what is happening here, and why?

thanks,

- Jay