Why is it that Tim Bray’s perfectly correct Atom feed is being converted into broken RSS2 by the time it goes through NewsGator and comes out in NetNewsWire?  The reason I ask is that whenever Tim posts photos in a blog entry they wind up returning 404s from his direct feed, but work perfectly when they come through Planet Intertwingly.  It’s crazy.

The actual feed content contains (excerpted):

<feed
xml:base='http://www.tbray.org/ongoing/ongoing.atom'
…
<entry xml:base='When/200x/2009/01/22/'>
…
<img src="PS082906.png" alt="Fog" />

When I view the XML source in NetNewsWire though, it’s been corrupted into an RSS2 feed and the image tag is now:

<img src="http://www.tbray.org/PS082906.png" alt="fog" />

I can understand NewsGator messing up the slightly more complex than normal usage of xml:base (despite it being a very annoying bug), but why on earth would it convert everything to an RSS2 feed?