On project property pages, use post-build events to run the bat file or batch file to copy the file to the output directory.
See the MSDN article on Build Events
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Have you checked this question Visual Studio Custom Build Rule? It looks like this might work for you, set up a custom build step (i.e. copy a file) and associate it with the file types of your custom content files.
Then, when you add another file, you do not need to change the post-build step. I don't do C ++ anymore, and I did not know that you can do this, it's nice to know that there.
Hope this helps,
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