Rhino save as

Is there a way to set the default save option in Rhino 6 to save as a Rhino 5 file.

I looked in preferences and don’t see the option.

Otherwise is there a way to script the setting to toggle the dropdown to choose Rhino5?

I love rhino 6 but I have a 3rd party plugin that I frequently use and they are not Rhino6 compatible yet…


I found a command line option to change the version within the saveas. Solved.

What was the command line? I am trying to do the same thing . Please help

Thank you