title: Copy always to output directory does not work
body: <p>I've got a simple console project where I'm reading two Excel-files. The Excel-files are included in the project ("add existing item") and I've marked them with "Copy to Output Directory". However, they are not copied to the debug-directory when debugging/running the code. </p>
  
  <p>I feel like I've forgotten something trivial. What do I need to do more?</p>