Note that the above instructions require that the WHT file type be registered
with WinHTTrack.  The installer typically does this, but if you chose not to
do this, you can overcome it by modifying the start line:
   Run(@COMSPEC & " /c Start " & $CmdLine[$i])	

to something like:
   Run(@COMSPEC & " /c Start ""c:\path_to_winnht\winhttrack.exe"" " &
$CmdLine[$i])	

Note the double quotes ("") - they translate to single quotes (", not ') which
is needed if you installed to the default location with a space in it, such as
"Program Files".