There is no need to apologize for the delay

I will try the command and let you know.
One suggestion. Why do not you use the way JRiver handles external players ? With Jriver you just indicate in the configuration that you want to use the external default player for blu ray or whichever file you want and in that way it uses the default windows player for the relevant file.
With Jriver DVDFAB and all other players work fine.
I can send you a screenshot of how the configuration is done if you wish.
Thanks a lot.
Andreas