Thanks for he reply.
This sort of confirms what the Plex Developers told me when they responded to my question.
Their answer seemed to suggest that they wouldn't be willing to develop a "custom MFT or a MediaStreamSource. There may also be DRM concerns if the files are protected."
So if they won't do this I was hoping to pursue my own application which would accommodate the requirements of other Windows Media Centre users.
My first and main question would be: Why aren't .wtv .dvr-ms included in the supported audio and video formats when they have been integral to WMC users for so many years? Restricting access to such formats, given the lack of development/inclusion in Windows
10 perhaps how are developers supposed to produce applications which can in part replace WMC and usable y a wider audience?