"ClipboardPath" software adds a new command "Copy Path to Clipboard" to the context menu for files and folders. Pasting the complete filename or foldername into any dialog or editor is just a mouse click away. You always get the full path. This software is free for end users.
P. Singer, T. Niebler, M. Strohmaier, and A. Hotho. Proceedings of the 22nd international conference on World Wide Web companion, page 171--172. Republic and Canton of Geneva, Switzerland, International World Wide Web Conferences Steering Committee, (2013)