A. Windows XP and Windows 2000 both include the Encrypting File System (EFS). If you have NTFS permissions to a file that another user has encrypted, you will receive an "access is denied" error.

To determine whether a file is encrypted, perform the following steps to enable the view attributes option in Windows Explorer:

  1. Start Windows Explorer.
  2. From the View menu, select Details.
  3. Select the Attributes option, and click OK.

If a file has an E attribute, that file is encrypted. Only the user who encrypted the file or the recovery agent user can decrypt the file.