title: Powershell scripting clean up activity
body: <p>I have a scenario here, i am working on files clean up activity. </p>
  
  <p>I have folders and withing the folder i have excel and pdf files. I want to retain the last two modified files and delete all other files. </p>
  
  <p>Please help me writing the script. </p>
  
  <p>Regards
  NKS</p>