How can I set up video files so that, if a film is foreign, the subtitles automatically play?
Finally, I found a video on YT.


Open notepad
Type "0" on the first line
Type "00:00:00.00 --> 00:00:00.00" on the second line
Save as .srt file type


Now you have an empty .SRT file that MKVToolNix accepts.

You can also edit the file order and the default audio/video files in the program itself.