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Windows Photo Viewer – Restore in Windows 10
Usually you could use Windows Photo Viewer to view your image files in a variety of ways. You can also print, order prints, attach pictures to an e‑mail message, burn, or open photos in another app on your PC.Windows 10 uses the Photos app as the default app to open image files with instead now. By default, Windows Photo Viewer is no longer listed in Open with, and only has .tiff files associated with it in Default Programs.
Source: Windows Photo Viewer – Restore in Windows 10 – Windows 10 Forums