I\'m using the following when trying to open a local file:
some document&l
You can only open some types of files in browsers, like html css js and mp4, otherwise the browser will want to download it. Also remember that browsers replace spaces with %20. I recommend right clicking the file and opening it with chrome then copy that link and using it.
You can open files that are local as long as it is a file that is on the file that is trying to open another file is local.