By default, when you open an image file in Windows 8.1, Windows uses the Modern UI Photos app to open the image for you. If you are using Windows 8.1 almost exclusively through the Start Screen, this is fine. However, if you are viewing image files on the Desktop, having Windows throw you back to the Start Screen every time you want to view an image file quickly become annoying. To avoid this annoying behavior, you can instruct Windows 8.1 to use a different application to view image files.
To do so, go to the Desktop, and then right-click on an image file. From the context menu that appears, select Open With, and then Choose Default Program.
When you click on Choose Default Program, Windows will display a list of every application on your system capable of displaying image files. Click on one of the applications to select it as the default picture viewer. (If you have no other image viewing applications installed on your system, Windows Photo Viewer is included with Windows and will allow you to view image files while remaining on the Desktop.)