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File mode has key bindings permitting different file system operations such as copy or rename. These commands all operate on the current file. In this case, the current file is the file at point, or clicked on when pulling up the menu.
One menu item toggles the display of all available files. By default, only files which Emacs understands, and knows how to convert into a tag list, are shown. By showing all files, additional files such as text files are also displayed, but they are prefixed with the ‘[?]’ symbol. This means that it is a file, but Emacs doesn't know how to expand it.