Wikipedia
Whizfolders
WhizFolders is an organizer and outliner for managing notes on MS Windows. WhizFolders has been around since 1998. Its predecessor WhizNote, a plain text notes organizer, was released in CompuServe forums in 1993.
WhizFolders allows to manage your information in two-panes--the left pane being a hierarchical list of note titles and the right-pane contains the detail or text of the selected note in the list. The notes can be merged when copying to the clipboard, or when exporting or printing. A boolean search for information is available. Keyword tags can also be assigned to the notes to find them even when the actual tag is absent in their text.
A freeware viewer is separately available to read WhizFolder files.