title: Visual Studio Setup Project - Include .reg file on installation
body: <p>I'm creating an msi of a WinForms-app by using a setup-project.
  One last thing I'm struggling with is adding entries in the registry.</p>
  
  <p>I have to make some changes ( or create) a few entries in the register for the embedding of SAP.
  The client will send me a reg-file that I have to use with the installation.</p>
  
  <p>Can anyone help me out on how to achieve this?
  Is it possible by using the reg-file or do I have to do it by code (custom action)?</p>
  
  <p>This is the first time I have to create a setup like this, so bear with me.
  I've tried to search for it, but haven't found a satisfying answer yet.
  Or at least, I don't think I have...</p>
  
  <p>Thanks.</p>