Thanks for the reply. I know hardware is the simple route, but I simply cant afford it right now. I do have my eye on a Dune unit, they look fantastic, but I cant help thinking there must be a solution for this somewhere. I have found a plug in for windows media centre, which allows it to see iso's, automatically mount them to a virtual drive and play them. However, extender support was disabled while he fixed some code... That was 2 years ago! I would also prefer to not have to go back to WMC just for isos, but if it was a solution I would.
Most of my media is mkv, but for 3D I really want to avoid converting films from the native iso to h-sbs for quality reasons. In 2d the difference is minimal, but I feel the difference in 3D is worth trying to retain if possible but it seems over a network its not possible without a media player, which I just cant get my head around!