Enforce Rhino to ask a "save as" opening an existing file

Since the product we’re modelling is not a straight forward process, I have to rename often an existing file whenever I open it.
And I do forget this quite often. So it would be a nice surplus that whenever I open an existing file, Rhino automatically asks me if I want to rename the file BEFORE working on it.
Can I tweak a variable for this or is there another way to make this happen?

You could import an existing file instead of opening it. Would that help?

Right, start each time with a new file and import the one on which you want to work.
Good idea!