How do I configure my app install package to not overwrite the existing config in VS2010?

jxbma used Ask the Experts™

I've got an winform application built using VS2010.
I've created a deployment project to generate a setup/installer.

Currently, when running the generated "setup.exe", the application's config file get's overwritten.
For now, I'd be happy making a backup copy of the config (if it exists) before copying in the new config.

I'm relatively new to the world of "installer."
What's the best way to do this?

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Top Expert 2011
you can use Custom Action  for your needs
public override void Install

see sample and write your code
Walkthrough: Using a Custom Action to Display a Message at Installation

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