Code review against other sources

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The code should be code reviewed against other sources for creating shell extensions.

For example:

• https://www.codeproject.com/Articles/441/The-Complete-Idiot-s-Guide-to-Writing-Shell-Extens
• https://github.com/google/google-drive-shell-extension
• https://github.com/yanxijian/ShellExtContextMenuHandler

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• https://stackoverflow.com/questions/72118332/how-to-write-a-shell-extension-in-c-for-new-windows-11-context-menus
• https://devblogs.microsoft.com/oldnewthing/20100312-01/?p=14623
• https://github.com/microsoft/Windows-classic-samples/tree/main/Samples/Win7Samples/winui/shell/shellextensibility/explorerdataprovider
• https://github.com/chrdavis/PIFShellExtensions/tree/master/PIFShellExtensionsLib
• https://github.com/TortoiseGit/TortoiseGit/blob/REL_2.14.0.0_EXTERNAL/src/TortoiseShell/ContextMenu.cpp
• https://github.com/WinMerge/winmerge/tree/v2.16.26/ShellExtension/ShellExtension
• https://github.com/stax76/OpenWithPlusPlus/blob/master/OpenWithPPShellExtension/DLL.cpp
• https://github.com/microsoftarchive/msdn-code-gallery-microsoft/tree/master/OneCodeTeam/C%2B%2B%20Windows%20Shell%20context%20menu%20handler%20(CppShellExtContextMenuHandler)