Solve : Difference between Shell and ShellEX?

1.	Solve : Difference between Shell and ShellEX?
Answer» Can someone explain to me the DIFFERENCE between the Shell and SHELLEX and when to USE the ContextMenuHandlers ? What is the difference between all these ? [HKCR\Folder\Shell\] [HKCR\Folder\ShellEx\ContextMenuHandlers\] [HKCR\Directory\Shell\] [HKCR\Directory\ShellEx\ContextMenuHandlers\]

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