DragDropToClipboard is a portable app that provides a simple way to discover a specific file path.
As the name implies, you can simply drag n' drop a file in and the complete file path will be saved to the clipboard. This is an ultra-simple app; no configuration, no confirmation that the process has been successful other than viewing the clipboard contents or pasting the result somewhere. That said, not everything needs to be overly complicated. If you need to find a path fast, etc., then this will fit the bill and the fact that it is portable is just a bonus.