In a lot of others games like this, its all saved in Web Explorer Temp. files, try to look the Cookies and the JavaScript Parameters in them.
Its like a full pack of web page files.
But have to use some special software who can read those files.
Maibe use a Web-Sniffer in real time when you save , in the exact time the file for savings are show in the webpage from Web-Sniffer.
So you can see what kind of file its look like.
Humm...i have to try that.