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             </-ADD ENCRYPT/DECRYPT MENU TO CONTEXT MENU-/>

This will add the ability to encrypt/decrypt files or folders on your
computer. This works only in Pro version of XP.

- open regedit
- go to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\
  Explorer\Advanced
- create new dword value named EncryptionContextMenu, give it the 
  value of 1

Reboot your computer.