For you after running the * .reg file above and still don't see the Windows Photo Viewer option , because your account is in User rights, it is not effective to merge * .reg file into the system. To fix this, please logout and log in to an Administrator account, run the * .reg file again and log in to the account you are using.
From now on, every time you double click on the image, you will be viewed with Windows Photo Viewer, do the following:
That's it, the Windows Photo Viewer is familiar, as fast as the wind has returned to your side.
If you change the app settings by default, try the following way. Right- click on the image you want to open with Windows Photo Viewer> select Open with > Choose another app .
In the menu that opens, select Windows Photo Viewer and check the option Always use this app to open .png (this may be different depending on the file format you are opening) files as shown, click OK .
The Windows Photo Viewer icon will replace Photo in front of the image name and open the familiar image viewer window.
Note, this way images with the same format as the ones you selected will automatically be opened by default with Windows Photo Viewer. To open another image format, you need to select an image in that format and repeat the above steps. Here I have done with .png and .jpg.
Note:
If you perform an upgrade from Windows 7 / 8.1 to Windows 10, the system will display the Windows Photo Viewer option as an application to open and view photos, but if you choose to install Windows 10 directly, you will not be able to find See Windows Photos Viewer on the system.
We can infer simply that Microsoft has "retired" Windows Photos Viewer application (this application has been around for a long time, since Windows XP or 2000, or before). It is a new and strange Photos feature. If you search through Settings> System> Default apps , you won't be able to see:
Or when you check in Control Panel> Default Programs> Set Default Programs> Windows Photos Viewer , it will only see this application supports 2 image formats: * .tif and * .tiff only:
Good luck!
See more: How to download and install Windows Media Player 12 on Windows 10