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Never used .rar file so not quite everywhere. Have only seen it from linux users.

Yes you can put any file in a jar file. I have no idea what your IDE is capable of, but I can put any file in a jar file.

How does that differ from a text editor?

I can't open a .rar on WinXP
you can put any file, including source in a jar file.

What is a simple database?
Does it have rows and columns and selectable fields?

What OS does a .rar file come from? Why isn't the app in a .jar file?

What database languages does it support?