Issue: User unable to open jpg files using Photos (app).

Solution:
1) Run powershell and run as administrator
2) Type get-appxpackage *Microsoft.Windows.Photos* | remove-appxpackage
3) Type Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”} 
4) Reboot computer

Reference:

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