I am trying to learn how the PSO quest files work and I have a few questions.

Does anyone know what each of the files contain?,I have been told that the
second one contains a mini program that controls the door,monsters,buttons,etc

Are they store in the standard format?
I was also told that they are encrypted,wich I do not belive.

Is the third file (like in the easter quest) a jpg/gif file?

I know little about the file system,but I am willing to learn.

Hope someome outhere knows.