Chony,

I understand that one thing which sets Yamaha styles apart from the others is that you can actually rename them with the .MID extension, and view them in a typical sequencer (without the need to convert). The markers in the resulting MIDI file identify style parts, so do not muck around with them; however, if you want to look at them, it is way easier than to look inside the style files for any other brand.

Disclaimer: I do not own a Yamaha keyboard, and have no personal experience in doing this. Please let us know if you have had success doing this.

Good luck,
Alex