Maximum PC

So, here's a question I haven't been able to find a straight answer to on several Google searches and Boxee support.

The question is: I have an external HDD attached to my Boxee Box. Boxee sees it fine, as do my Windows computers. However, I'm not getting it to show up on my 360 in the living room, though the 360 can see all shares from my main PC. The reason I went with a Boxee and an external HDD is not only to make my new 32" HDTV in my bedroom "smart", but to also work as a file server for streaming so I don't have to keep my power-hog main gaming PC running 24/7.

So, is it possible to get a 360 to see the USB stored movies/songs on a Boxee Box or not? I do have Windows Server selected on the Boxee as well.

Thank you all very much.