Menu Tools -> Preferences (Show settings = ALL) -> Input/Codecs? Then at the very bottom of the right panel set the option "Change title according to current media" to "$F" or "$u" (without quotes {f= file name and path u= file name only}). Save, exit and restart VLC. Also I know this was an old that I just necroed but it was the first result I found when I googled that wasnt a video, support ticket, or for a non windows operating system.