Specifies the destination path for a download item. Works together with
the SourceN property. The value
may begin with a @-prepended keyword designating a personal user directory
such as @DESKTOP or @PERSONAL.
This property can only be set via a <PARAM> tag.
To specify a download item programmatically via script, use the method AddFile.
Usage: <PARAM NAME="Destination1" VALUE="c:\file.ext">
Relevant User Manual Sections: 6.1, 3.1.