title: Specify special folder in mongodb config
body: <p>I would like to specify <code>ProgramData</code> folder in my MongoDB configuration file</p>
  
  <pre><code>storage:
     journal:
        enabled: true
     dbPath: "%programdata%/db/"
  net:
     bindIp: 127.0.0.1
     port: 27017
  </code></pre>
  
  <p>Does anyone know the way to achieve this as <code>%programdata%</code> substitution doesn't work.</p>
  
  <p>Thanks.</p>