I'm still trying to get the forced sub titles to show up for the American version of the Avatar extended version blu-ray and this time I noticed that when I used MKV with the two english subtitles selected that DVD Fab creates a sub tile external file. I went to the video converter section to see if I could convert that MKV file with that external sub title file, apparently DVD Fab creates a sub title file that it can't even read. So what good is that file? It can't be played back and DVD Fab has no idea what it is... Which seems kind of stupid, a video converting program that doesn't even recognize it's own file format.