title: PowerShell $($a) Has Unexpected Result
body: <h1>PowerShell 4 ISE</h1>
  
  <pre><code>PS&gt; $MyFile = "MyFile.txt"
  PS&gt; $a = "dir $MyFile"
  
  PS&gt; $a
  &gt; dir MyFile.txt 
  
  PS&gt; $($a)
  &gt; dir MyFile.txt 
  </code></pre>
  
  <p>Why does <code>$($a)</code> not execute the command <code>"dir MyFile.txt"</code>?</p>
  
  <p>Thanks in advance.</p>