If you have a valid Schengen visa in your passport, you can visit it in the Schengen countries.

I recommend you travel insurance issue.

Yes, you can visit France with an open Austrian visa, the main thing is that it was a multivisa. And medical insurance must be registered!

Yes, you can visit France with an open Austrian visa.

If you are traveling through a travel agency, you will automatically receive insurance. If alone, then at will.