JADGEN help....please.

I'm trying to create a Jad file for a game that i downloaded as a zip file.
when I open the zip file the jar file shows up as a rarwin type icon. I know
I have to type the url of the jar file into jadgen but I'm having a heck of
a time trying to figure out the address to type in. It states that the jar
file is located in the root directory. Any ideas? all the games I've used so
far have the jar file already with them. thanks in advance.