I assign a fairly unique filename to everything, even if it’s only a working title or even if I intend to use something fairly generic as the real, actual title, simply to avoid confusion down the road. But the big secret that I’ve learned is to add the date to the file. Then, I change the date as I do my editing, so that I can save and distinguish between all my versions in case I decide I don’t like what I’ve done and wish to revert. For example, I know at a glance, even years later that “Resisting Arrest 24 May 2003” is not as thoroughly edited as “Resisting Arrest 7 August 2003”. This helps a lot particularly in tracking and selling very old material.
Another hint, if you decide to adopt this system… For a work in progress, I just leave the filename with a month-date, not a specific day. For example, my current work in progress is “Draco, The Dragon December 2016”. That way I can work on it day to day without having to mess with altering the file name. It’s close enough, until editing time.
I haven’t checked lately, but I’d guess I currently have an archive of several hundred manuscript files (note this is part because I keep my revisions) and this system really helps me a lot. It was very frustrating before I developed it.