Victor,

>Has anyone before created a standby database from Windows to any *nix
> platform? Windows being the primary db and *nix being the active standby.
> Helpful ideas are welcome. Thank you. NB: in Oracle 11g.
>

Oracle do not support such an arrangement. Look at the requirements and you will see that stated explicitly.

You either stay with Windows or switch to Unix
> --
> Regards,
> Victor Kisovi
Muriithi