title: WiX: How to use relative path to SolutionDir
body: <p>I have 2 folders with solutions:</p>
  
  <p>MyNETProject (NET project)
  MyWiXInstaller (WiXProject)</p>
  
  <p>My installer needs to get files from MyNETProject\bin\Release and to pack them to installer.
  How I can set path to NET project in WiX using SoultionDir variable? 
  I have tried this way:</p>
  
  <pre><code>$(var.SolutionDir)..\MyNETProject\bin\Release
  </code></pre>
  
  <p>But it does not work.</p>