JAR Packager?

hey everyone, im using firefox and am wanting to make my own add-ons and themes but they have to be in a JAR file, does anyone know a JAR packager to package files into a JAR file? preferably free!

BTW i have been looking for one and will post if i find one

A .jar file is an executable java file, AFAIK. It’s not a package.

Link to man page: http://java.sun.com/javase/6/docs/technotes/tools/windows/jar.html

thanks everyone but i got it to work, you have to enable “show extensions” and then rename the file