How does Win10 set the traditional photo viewer as the default app?

In the opening part, users who have newly installed Win10 will generally encounter this problem, and users who upgrade from the old version of Win7/Win8/Win8.1 to the official version of Windows10 will not encounter it. Of course, if you are used to using the Modern version of the photo app, you don't need to care about the following.
New users who install the official version of Win10, if you want to continue to use the traditional photo viewer as the default application, you may find that you can not find the traditional in the right-click mode of the file or the default application settings in the Modern version. The shadow of the photo viewer. In the traditional control panel, the photo viewer can only choose to associate with the tiff file.

▲ Modern version of the default application settings no right of traditional photo viewer

▲ Open the picture in Windows Photo Viewer can not find

▲ Control Panel The photo viewer in the file association can only choose to associate with the tiff file
How to solve this problem?
The method of fixing the photo viewer file association is as follows:
• First press Win+R to open the run. Type regedit to open the Registry Editor.
• Expand
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows Photo ViewerCapabilitiesFileAssociations
• Create a new “string value” on the right side, change the new value name to the file extension to be associated, such as “.jpg"text- align: center "> right after

open in jpg file you can see the traditional Windows photo Viewer and the following diagram:

other alternative Legend
The type image setting method is the same as above. When adding the registry key value, the numeric data is always filled in as “PhotoViewer.FileAssoc.Tiff”.