title: How to add reference `Microsoft.TeamFoundation.TestImpact.Client.dll` in Visual Studio 2012?
body: <p>I'm writing a customized activity for TFS build process workflow, e.g. guideline <a href="http://www.ewaldhofman.nl/post/2010/04/29/Customize-Team-Build-2010-e28093-Part-4-Create-your-own-activity.aspx" rel="nofollow">here</a>.</p>
  
  <p>The post requires to add reference to <code>Microsoft.TeamFoundation.TestImpact.Client.dll</code> at path <code>C:\Windows\assembly\GAC_MSIL\Microsoft.TeamFoundation.TestImpact.Client\10.0.0.0__b03f5f7f11d50a3a</code>. I cannot find this path on my machine installing Visual Studio 2012.</p>
  
  <p>Where would I find this reference?</p>