thank you for the PM.
For Regarding two subtitles at the same time I use srtmerger for srt file, I merge 2 files in 1 file, Is the best.
If one is a idx/sup... I merge this fil with the video with mkvmerger and use ffdshow video decoder with mpc-hc for the second subtitle.
ffdshow doesnt work with idx/sup.... It's so bad