Targeting problem?

I’m trying to gain access to my google calendar’s XML feed but am having problems.

The address it gives you for the feed is ‘http://www.google.com/calendar/feeds/ceidobeatbox%40googlemail.com/public/basic’ which isn’t an XML file, although it still ‘works’ as a feed if you put that address into your browser.

Why does my browser recognise it as a feed but when I try with PHP it doesn’t recognise it?

What I’m eventually trying to do is get the xml data into Flash using as3, but as I’ve recently found out, there isn’t a way to do it other than using a server-side language to ‘pass’ the data on to it. Hence my current situation.

Any help would be much appreciated. Thanks.