AddAttachment
The AddAttachment function adds a file as an
attachment to the mail.
Syntax
Important: This feature is deprecated, and may be removed
in a future version.
CALL ui.Interface.frontCall("WinMail","AddAttachment",
  [ id, fileName], [ result ] )
- id is the message identifier.
 - fileName is the path of the attachment; the path can be relative to the directory from which GDC is run, or absolute.
 - result is the status of the function.
 
Usage
This function adds a file as an attachment to the mail. The file must be located on the front-end.