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Choose default programs
As with every previous Windows version, this edition of Windows designates certain apps and utilities as default file handlers. Photos, for example, use the "modern"/Metro-style Photos app, which displays a single image full screen and doesn't do well with folders full of images.
If you do most of your work on the desktop, you'll probably prefer the Windows Photo Viewer app instead. You might also want to adjust your default choices for handling PDF and audio files.
To get to the Set your default programs screen, press Windows key+W (Windows settings) and type default in the search box. Then click its entry in the results list.