This simple tool gives Windows Photo Viewer the following features:

  1. Middle click to toggle window’s size between normal and maximum.
  2. Scroll up/down to show previous/next image.
  3. Ctrl + scroll up/down to zoom in/out.
  4. A to show actual size.
  5. F to show fit size.
  6. Ctrl + A to toggle deafult presenting style between actual size and fit size.

Source code