[canthonytucci]

Why are you trying to work with files in the metro interface?

I'm having trouble coming up with a use case where I'd need the file chooser to do any of the things you'd want to do in the touch interface.

I can't speak to the music file thing because I haven't dealt with music files in years, it's always been an annoying and tedious experience for me (as is working with any large number of files with wonky metadata), so I switched to streaming and haven't looked back.

EDIT: That said, videos on my NAS just show up in the metro "Videos" app and I can watch them without issue. I haven't tried it with music but I can't imagine why that would be any different.

[BrentOzar]

Videos and music based on a NAS do indeed show up automatically. I just don't need that part - I need the music and videos when I'm on the road. (Streaming doesn't work on most airplanes.)

[PaulHoule]

It's fair to expect to write a document in Microsoft Word on the Desktop and then view the file, or a PDF copy, when it is in tablet mode.

A good file chooser enables that scenario and generally, maximizes the benefit that Windows 8 brings to a tablet OS, which is the Windows desktop. If Metro can stream, read from memory cards, view files from Desktop apps, etc. the high purchase price of these systems would be justified.