You can set apache to return a content type of application/rss+xml for any document (despite the more appropriate text/rss+xml … as it is text after all).
Though, it all depends on your browser + operating system combination, if the browser doesn’t think anything different of the content-type and decides to display it, it’s hard to just pass it off to an application.
Mozilla/Firefox/et al might need a plugin to do this. And then your operating system would need a default rss-feed reader registered somewhere.
I just don’t see the point. Why not copy the address and paste it into your feed reader? Hell, some even allow drag + drop. The problem is that this ‘draft’ requires a lot of work that really isn’t needed, especially when people don’t have any problems doing it manually now.
