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is it just a shell that runs a batch script?

Can you explain what you mean by that?

If you think it is a batch script, I assure you, that it is more than just that. I coded this manually in VisualBasic using the .NET Framework. And I have the source code publicly avaliable under the GNU GPL V3.0 license. That means anyone can expand on it, and distribute it as they like. If you would like to make your own, or expand on it by going to the GitHub repository.