title: Can I create an MSI with WiX that upgrades an application installed using a Burn Bootstrapper?
body: <p>Say I have an application that has been installed using a Setup.exe created by a WiX Bootstrapper project.  I now have a new version of the application I wish users to upgrade to, but for various reasons, I would like to distribute this upgrade as an MSI, not a .exe.</p>
  
  <p>When I tested this, I found that I ended up with 2 instances of the application showing up in Add/Remove Programs, one the version installed by the .exe and one by the .msi.</p>
  
  <p>I note that both the Product element in the Setup project and the Bundle in the Bootstrapper project both have UpgradeCode attributes which differ.  I did attempt to create an MSI with the same UpgradeCode as the Bundle to test, but this displayed the same behaviour as before.</p>
  
  <p>Is there a way to upgrade a Setup.exe installed product with an MSI?</p>