No XML, Excel,PDF or CSV support yet.
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Representing elements and their contents is easy enough. But attributes, comments, processing instructions, entities... And remember, an XML document can include a DTD (it does not have to be in a separate file).
To present it as a file system in a useful, non-convoluted way? I will be very, very interested if it's possible, but not holding my breath.
On the other hand, I can’t help but point out that a related technology comes very close to demonstrating how you might map XML to a file system: XPath. Probably the biggest issue would be syntax, and again largely due to namespaces.