Windows Photo Viewer is the default application to open most of popular image formats on your PC, but if have upgraded to Windows 10, you will see a new Photo app that gets associated with images automatically. Photo App is a new app that comes with Windows 10 featuring modern sleek interface and greater optimization for touch functionality.
It is cool, easy to work with and feature-rich, but for some reason if you don’t like the change and still prefer the good old one and wuld like your Windows 10 to open all photos using Windows Photo Viewer, you can still do that; don’t worry, Windows Photo Viewer is not dead yet.
Click on Action Center on taskbar and then click All Settings.
Click Default apps and then in the right side scroll over to Photo Viewer. By default Windows 10 settings, you will see Photos there. Click the drop-down list and you will find all the apps that can be used to open image files. From the list choose Windows Photo Viewer.
That’s it. You have now successfully associated all images to open with Windows Photo Viewer.