title: Can you start a filename with a $?
body: <p>I've never even considered this before, but one of my clients is trying to name a file starting with a $; $template.php.</p>
  
  <p>Is this allowed?</p>
  
  <p>I'd like to be able to give him a reason if it's no allowed?</p>
  
  <p>Thanks!</p>