this is a older JDK1.0.2 simulations, they are not made using Easy Java Simulation (Ejs), thus they do not have *.xml source codes.
But you can download the standalone files, it think the source is inside but cannot be read by Ejs.
hope that helps ;D
by the way,
you can search the entire forum and find that Prof Hwang has an Ejs version of a similar applet
An object under the water look differ! (Location and shape)