title: Windows batch file - check if file has been modified
body: <p>I'm configuring a windows machine to continuously run a powerpoint presentation.  The ppt file is located on a samba share (windows file sharing) and will be updated periodically.  I need a way to make a batch file that will restart the ppt slide show if the file has been changed.  The batch script will run on a a regular interval, and will hopefully check to see if the file has been updated, and re-start the slideshow if it has.  </p>
  
  <p>If there is a way to do this in powershell, that would work too.</p>