i cant make my java project to jar file

i cant seem to create my java project into jar files so any one can run it. i have a folder with 10 java files and two folder and some images and music. take a look at my project files tree. its on a image.

i google it and to create jar file i did this:

-open eclipse
-run project
-right click project
-export
-java
-runnable jar file
-this will open a runable jar file export window

so far good but here is the problem:
on that window under lanch configuration i cant find my Main.java. on google they say that "you will see your file under lanch configuration" but i cant see it. i see some of my other project files but no Main.java.

this project is a applet and i have no packages. i am not sure what i am doing wrong.