Where are classpaths read from?

Hi guys,

Im going nuts here. Im use Flash CS4 along with FlashDevelop (to write the actionscript). I have my classes distributed in different folders (outside my fla folder). But the strange thing, is when I open the Preferences window in Flash, and Actionscript 3.0 settings (as well as AS 2.0 settings) and remove ALL the classpaths from there, the application still works!

Im seriously going nuts. Where are the classpaths read from ?!?!? Is there anywhere else, other than that AS 3.0 settings dialog box?