Con tu permiso estimado
juanchoalsinavoy a agregar algo a tu interesante aporte.
El comando cipher.exe, es un comando externo que solo está disponible en las plataformas Windows 2000 y Windows XPTe voy a dar un + por tu aporte y agrego algo del sintax de cipher.exe ya que se puede utilizar para otras funciones también

Syntax
Displays or alters the encryption of directories [files] on NTFS partitions.
Nos muestra o altera la encryption de los directorios (files) en las particiones NFTS.
CIPHER [/E | /D] [/S:dir] [/A] [/I] [/F] [/Q] [/H] [/K] [pathname [...]]
CIPHER /W:directory
CIPHER /X[:efsfile] [filename]
/E Encrypts the specified directories. Directories will be marked so that files added afterward will be encrypted.
/D Decrypts the specified directories. Directories will be marked so that files added afterward will not be encrypted.
/S Performs the specified operation on directories in the given directory and all subdirectories.
/A Operation for files as well as directories. The encrypted file could become decrypted when it is modified if the parent directory is not encrypted. It is recommended that you encrypt the file and the parent directory.
/I Continues performing the specified operation even after errors
have occurred. By default, CIPHER stops when an error is
encountered.
/F Forces the encryption operation on all specified objects, even those which are already encrypted. Already-encrypted objects are skipped by default.
/Q Reports only the most essential information.
/H Displays files with the hidden or system attributes. These files are omitted by default.
/K Create new file encryption key for the user running CIPHER. If this option is chosen, all the other options will be ignored.
/W Removes data from available unused disk space on the entire
volume. If this option is chosen, all other options are ignored.
The directory specified can be anywhere in a local volume. If it
is a mount point or points to a directory in another volume, the
data on that volume will be removed.
/X Backup EFS certificate and keys into file filename. If efsfile is provided, the current user's certificate(s) used to encrypt the file will be backed up. Otherwise, the user's current EFS certificate and keys will be backed up.
dir A directory path.
pathname Specifies a pattern, file or directory.
efsfile An encrypted file path.