title: Can we use system environment variable in mstest .runsettings configure file
body: <p>I have added some variable to PATH, such as </p>
  
  <pre><code>set resultPath=C:\Temp\Results
  set platform=x64
  </code></pre>
  
  <p>And I want to use this variable in microsoft test configuration file .runsettings. e.g. </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RunSettings&gt;
      &lt;RunConfiguration&gt;
          &lt;ResultsDirectory&gt;$(resultPath)&lt;/ResultsDirectory&gt;
          &lt;TargetPlatform&gt;$(platform)&lt;/TargetPlatform&gt;
      &lt;/RunConfiguration&gt;
  &lt;/RunSettings&gt;
  </code></pre>
  
  <p>I tried both mstest.exes and vstest.console.exe by using configuration .runsettings file as above, but failed. The .trx file was created under .\$(resultpath) folder and one of test cases failed because it need x64 environment binaries to run, the default platform of microsoft test is win32.</p>
  
  <p>Any comment? </p>
  
  <p>My OS is win7, Visual studio 2012. </p>