title: How to handle properly environment values starting with numbers in cmd.exe. (eg.3DSMAX_xxx)
body: <p>I tried to use an environment value in <code>cmd.exe</code> like below,</p>
  
  <pre><code>set MAX_PATH=%3DSMAX_2011x64_PATH%
  echo %MAX_PATH%
  set MAX_PATH
  </code></pre>
  
  <p>However it looks like the <code>%3DSMAX_2011x64_PATH%</code> always is treated as a <code>DSMAX_2011x64_PATH</code>.</p>
  
  <p>I searched the answer for a day however I couldn't find it.</p>
  
  <p>How can I handle it properly?</p>