Hi
When I play these files using a normal media player, these files are already in the "left right split image" to b viewed in 3D
I assume the normal media player does not support the “side by side” or “interleaved” options like Toshiba Blueray player does.
But it seems that Toshiba Blueray player does not support the Matroska format therefore you would not be able to play such files using the Toshiba Blueray player.
I found some interesting info from Toshiba:
3D video content not displayed in 3D when using the Toshiba Blu-ray Disc Player on the Qosmio F750
http://aps2.toshiba-tro.de/kb0/TSB1C038C0000R01.htm