Image viewer (windows size = image size). With the contextual menu, or by double-click if ImageOpen is your image viewer by default, you can open an image (jpg, png, bmp, ico, tif ...), and you can start a slideshow in the selected folder.

Click on image to view next image (or "Next" - Alt+Right arrow). Select "Previous" (Alt+Left arrow) to view previous image. The "Slideshow" command allows you to start a diaporama; the "Faster" and "Slower" commands sets the duration of the timer.

Select "Top" so that ImageOpen always stays on top of the others windows. For the very large images, you can select "Open with IE" to view the image in Internet Explorer. The "No Border" command allows you to hide window´s border (e.g. to view icons in real size).

Requires Microsoft .NET Framework 2.0.