.ogm subtitles

Hi,
I have a problem when trying to create an .ini file for a .ogm video file. I want to start the movie with one specific subtitle, but the subtitles are muxed in the .ogm, so i don't know how to tell BSplayer where to find it, and all I get is the same default subtitle for every combination I try. I don't know what was the name of the subtitles files before multiplexing.

Can someone help me? Is it possible to do what I say?

Thanks!