No. I didnt manage to stream any mkv files via network or network share. They sisnt even play let alone watch them with subs. However they do load if u plug and play a hdd on the media centre's usb port.
I its me again,since i sent my iast message i checked my box & found i had no longer got iplayer,Having only had the box 2 months i am not pleased,this happened with my previous media player LEADING ME TO HAVE TO BUY THIS ONE.
No. Unfortunately it only streams the services on the device (ie; netflix, youtube etc) It does not support streaming from tablets or mobile devices.
There is an app for the device from WD but its just a remote to help you browse whats already on there. ( http://www.wdc.com/en/products/products.aspx?id=920 )