Whoa — today I was looking at my site’s traffic analytics report, and one of the search keywords was “air FileStream, there’s an example of reading and writing Xml”. I was baffled: someone searching that bluntly, and they still managed to land on my site? That’s no small feat. So I ran the same search myself, and here’s what came up — it all made sense in a flash: 
In the Flex Builder help docs, search for FileStream, and there’s an example of reading and writing Xml.
Strong………