"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.
Path2Clipboard adds a submenu in rightclick menu. It allows to copy a file path in clipboard in a different ways. Its configuration is available in English and Russian, but it's simple, and need no configuration at first start, just install and use.
4dots Copy Path to Clipboard is a free small shell extension that extends the right click menu of Windows Explorer and allows you to copy the path of the selected files or folders (one or multiple) to the clipboard.