> where I replaced the Properties with the line below
> C:\gnu\emacs-25.2\bin\emacsclientw.exe -na 
> C:\gnu\emacs-25.2\bin\emacsclientw.exe -c -n
>
> I get a error with 'filename or argument required' message.   and I
> got symantec virus warning too.
>
> How do I fix this please?

You need an empty argument to launch by double click.
Make a shortcut with target as shown below.
  C:\gnu\emacs-25.2\bin\emacsclientw.exe "" --alternate-editor 
C:\gnu\emacs-25.2\bin\runemacs.exe

When create file associations, you may want add --create-frame to
behave like other Windows application.  For example,
  ftype txtfile=emacsclientw -cna runemacs "%1"
instead of
  ftype txtfile=emacsclientw -na runemacs "%1"
as shown in EmacsWiki.

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