A Viewer for Windows version 1.6 has now been released.
With this update:
The program will now open an image via the Windows' ‘Open with’ feature, as well as via the command line, batch and script files.
If you pin A Viewer for Windows to your Windows' taskbar, you will be able to left-click on the icon there to quickly open recent files.
The Effect Selection boxes on the Viewer window are now movable.
The ‘Neutral’ profile may now be enabled or disabled.
Other minor corrections and improvements.