I've noticed that the "Open with" option is no longer displayed in the context menu (right-clicking on a file). It won't appear even if I press Shift + Right-click. How to restore this option?
Solution
Click on Start > Run.
Type "regedit" and press Enter, to open the registry.
Go to HKEY_CLASSES_ROOT\Unknown\shell\openas\command
Set the value of this key to "C:\%Windir%\rundll32.exe shell32.dll,OpenAs_RunDLL %1".
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