Sorry for the delay but I made some research.
So, this is how it works:
the idx and the sub file are a part of the DVD subtitle.
The subtitle is stored as a picture, in the sub file.
To use the file you need to rip the subtitle from there.
I used SubRip to do that.
It's a OCR based subtitle ripper.
It recognizes the fonts from the picture file and save them as a .srt file.
Sometimes it asks you what letter is displayed. Answer carefuly.
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