You can create a link within a note to an external document by using the syntax "file:///c:/myfolder/myfile.txt" and then click the link to launch it natively.
This probably isn't what you were asking for though. Sounds like you want the hierarcical list view to link out to external files. There is no way to do this.
However, there is no need to have the file in two locations. Just use the file in GoBinder by clicking its icon in the list. This launches the native application for that file type and even version tracks any changes you make to that file.
Does that work out for you?