Posted 26 November 2008 - 11:39 PM
I'm guessing here but I think it has to do with Microsoft observing the restrictions imposed by the DRM of music. I believe they are taking the approach that your use of the OS and network to circumvent the DRM is your responsibility but they are not going to provide software that has features specifically designed to violate DRM.
I noticed, for example, that the PVR function within the Windows Media Center will not allow a network drive to be used as a destination for recorded TV programs. I can only use a local drive as a destination. After recording to a local drive, there is no problem using Explorer to move a recording to a network drive but since the network drive cannot be designated as a location for the recorded program, it also cannot be used as a source location for Recorded TV playback. Ironically, I can designate a network drive as a source or destination for the Video Library (usually a location for user created videos) and any videos located there, including recorded TV programs, are visible and playable as part of the Video Library.
I haven't actually tried to access any of these network located items from a different PC on the network but I expect I would find the same restrictions.