Is this just a jar file or "executable" jar file?

I tried to run the program and got the "Couldn't find main class" error. Also, strange enough, when I observed the type, it wasn't an executable file! Any thoughts about this one?

.jar application

The .jar extention is for a java executable applicaiton or library.

For the couldn't find main class, see this : http://en.android.collaud.net/node/42#comment-58