Compression and Encryption

Right click on any of your files within an NTFS volume and select properties. Select the Advanced button
This is the window seen when encrypting or compressing a file. The corresponding window for a folder is very similar.
You cannot Encrypt and Compress a file or folder
Files can also be compressed or encrypted from a command line
These commands can also be used to discover the attributes of objects, or to change the attribute of a particular file type.

Switches for the Cipher command

/e encrypts
/d decrypts
/f forces action
/s:x affects directory x
/s: affects current directory
/q gives no reports
/i ignores error and continues
/file1 file2 file3  (note spaces between multiple files)
/*.txt *.doc *.htm  (note use of wildcard)

Switches for Compact command

/c compresses
/u decompresses
/s:x affects directory x
/s: affects current directory
/q gives no reports
/i ignores error and continues
/file1 file2 file3  (note spaces between multiple files)
/*.txt (note use of wildcard)
/f forces action
/a displays hidden or system files