fix: #362 Register PreviewHandler on Win10 190042ff #370
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Alas described differently in MSDN https://docs.microsoft.com/en-us/windows/win32/shell/how-to-register-a-preview-handler
a PreviewHandler (additionally or only) needs ShellEx{8895b1c6-b41f-4c1c-a562-0d564250836f} below the association key.
The MSDN sample https://github.com/microsoft/Windows-classic-samples/blob/27ffb0811ca761741502feaefdb591aebf592193/Samples/Win7Samples/winui/shell/appshellintegration/RecipePreviewHandler/dll.cpp#L206 creates the ShellEx key only below the association key, not the class name key.
See #362
cc @AdmiralSnyder