In Windows 10, Microsoft made it harder to use the good old Photo Viewer app and forced everyone to use the Metro app called "Photos" instead. There is no way to set Windows Photo Viewer as the default to open image files since it is missing from the list in Settings->System->Defaults apps. The classic Control Panel also allows only TIFF files to be associated with Photo Viewer. Here is how to fix this restriction and get Windows Photo Viewer working again in Windows 10 RTM.
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