To answer my own question above, there are no software players currently on PC which support HDR playback, as 10bits output is needed and this is not supported by windows yet.
Only MadVR supports 10bits output in Full Screen Exclusive mode, but MadVR doesn't support HDR yet.
Good news is Madshi (the author of MadVR) is working on HDR support, so hopefully it will be an option soon for the players supporting MadVR as a renderer (jRiver, MPC-HC, MPC-BE, etc).
So at the moment, given that the Roku 4, NVidia Shield or Amazon Fire TV don't support HDR, it looks like the Sony FMP-X10 is the only option to play HDR demo files to displays without an Amazon app supporting HDR or Samsung displays able to display M-Go content in HDR.
Is this correct or did I miss something?
Last edited by Manni01; 12-07-2015 at 06:00 PM.