Xbox 360 Internet Explorer Won't Stream

Hi guys, think this is my first post, but I want to know if anyone out there has been able to successfully stream from Tversity to Xbox 360 via the new Internet Explorer app available on the Xbox. I go to my http://servername/medialib/browse and I am able to successfully login and navigate my library. However when I get to a file that I want to stream (*.mp4, *.avi, *.mkv) and select it, I get the following message “Can’t download file Xbox 360 doesn’t support downloading files to local storage”

I am able to stream music via MP3 and view pictures but can’t seem to stream any video. Any ideas? My “Media Playback Device” is set to “Auto Detect”