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The GNU Privacy Guard extensions for the Windows Explorer shell allow you to access cryptographic functions of the GnuPG user interface using the context menu to files.
Decrypt and/or verify the selected files. FIXME: Add a link to the Gpg4win documentation for the decrypt and verify functions.
Encrypt and/or sign the selected files. FIXME: Add a link to the Gpg4win documentation for the sign and encrypt functions.
Import certificates in the selected files. FIXME: Add a link to the Gpg4win documentation for the import function.
Display this help.
Display the version number.
      If the GnuPG user interface (either GPA or Kleopatra) can not be
      accessed, a message box with an error message will be displayed.
      To get more information, you can either check the error log, or
      specify a debug file: Select the
      key HKLM\Software\GNU\GnuPG
      in the registry editor, create a new string value with the name
      GpgEX Debug File and the value of the debug filename
      (e.g. c:\temp\gpgex-debug-file.log).  To this file
      logging information is appended, after a restart if necessary.
    
Please find more information and new software versions at the Gpg4win website.