This is an old and long thread that over the years grew into asking a mix of things some are implemented some are not. I am not even sure the OP wanted to open any folder (including folders that are not yet a vault).
I am not sure the OP wanted to open any file, including files that are not yet in vault. We cannot do do that even if you use the GUI (See this).
Now we have a CLI, so at this point we need narrow, better shaped Feature Requests that can be done and closed.