External USB Drive Problem

I’ve successfully connected a 2TB external drive, and I can play .M4V files I have stored in the “TV Shows” folder (recorded using my Mac as a DVR). The first problem is when I try to play movies purchased from iTunes, I see the video, but there is no sound. The second problem is that I have a third folder, labelled “DVDs” and containing Video_TS folders, and this folder will not open at all. Anyone know how to solve either of these problems?

Unfortunately iTunes purchases must be synced or streamed via iTunes in order to play them on the AppleTV.

How is your DVD folder organized? There is a guide that better explains DVD playback here: http://wiki.atvflash.com/index.php?title=Play_DVD_Files