Is it possible someone could create an FTP Enabler app which runs off the USB stick like the SamyGO (non permanent) Telnet Enabler. To enable copying files to and deleting files from the USB stick in the TV from a networked PC.
This would get round the compatibility/stability problems when streaming video from a PC. Also the power saving effect of not needing your PC on whilst watching the file would probably pay for a 32GB USB stick after about 6 months.

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Meteorite MKV Repair