.STY (Style) file from PSX game [Who Wants to be a Millionaire]

Hi! Just downloaded jPSXdec. I am able to rip most of the sprites and sounds from most PSX games (like Ape Escape or Parappa the Rapper).

I have the italian version Who Wants to be a Millionaire - 2nd Edition, where the italian host reads every question and answer. I wanted to rip these sound files, but when I open the game in the program, I get these files:



I'm guessing PSX.STY contains all the game content, like voices, music or sprites.
I've been searching online the whole night about these .STY files, I downloaded a Style Player but it won't work.

So, I'm asking you: what excatly is a .STY file? How can I open and/or extract things from it? And, do you know other games that look like this?

Thanks in advance, and sorry for the bad english ^^