title: What is a Cryptobackup file? Cannot delete folder because of access denied to a cryptobackup file
body: <p>When I tried to delete a folder, I was encountered with the routine error message that some files in this folder are in use and you cannot delete it. After playing with the files I found out that none of the main files were causing the problem. But there was a  file which was hidden and cannot be deleted. Apparently that file is not a virus and it is in fact the Cryptobackup of an already pdf file previously in the folder. I tried a lot of things but couldn't delete it because the system says access is denied to this file. Even tried to delete it from a command line run by administrator. But not successful.</p>
  <p><a href="https://i.stack.imgur.com/pwA7v.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pwA7v.png" alt="enter image description here" /></a>
  The funny thing is that now that I have seen hidden files (especially protected system files), I have realized there are a lot of Cryptobackup files which are the backups of pdf files I have generated before. But I can delete them. But this one cannot be deleted. Weird.</p>
  <p>P.S. Could someone with reputation higher than 1500 create the new tag <code>cryptobackup</code> please?! I think it could be helpful for others too. Thanks.</p>