title: Running a CustomBuildStep in a WIX project file (MsBuild)
body: <p>Visual Studio 2015.
  MsBuild.
  Wix ToolSet v3.10</p>
  
  <p>This is a sanity check.
  I am trying to run a CustomBuildStep from within a WIX .wixproj file via MsBuild.</p>
  
  <p>I am very familiar with Visual Studio 2015 .vcxproj's and run CustomBuildSteps in almost all of my projects.</p>
  
  <p>I added a CustomBuildStep to one of my .wixproj files but when I run it via MsBuild the CustomBuildStep never fires. I am 100% positive that I have the </p>
  
  <p>Does anyone know if a CustomBuildStep is not valid within a WIX project file?</p>
  
  <p>Has anyone successfully gotten a CustomBuildStep to work in a WIX project?</p>
  
  <p>Thanks.</p>