title: Build Stage in Yaml fails
body: <p>I installed a GitLab runner in a Build server and registered a runner for a Project I have in GitLab.</p>
  <p>The Build Stage has the following in the first line:</p>
  <ul>
  <li>'D:\scripts\NuGet\NuGet.exe restore %CI_PROJECT_DIR%%SOLUTION_FILE%'</li>
  </ul>
  <p>I already verified %SOLUTION_FILE%' has the right value however I get the following error:</p>
  <p><strong>Cannot locate a solution file.</strong></p>
  <p>I already checked everything I could think of but I can't figure out why it can't find the solution file.</p>