How to Install a Copy Hook shell extension for a UWP app

I'm packaging my classic Win32 application as a MSIX package to be distributed on MS Store.

The application includes a shell extension that implements `ICopyHook`. With the traditional installer, the shell extension DLL is registered under the `CopyHookHandlers` registry key.

With MSIX, the extension has to be declared in the AppManifest.xml file. However, per documentation [1], there is no way to add a copy hooker handler extension. The only handler types available are context menu and drag and drop.

This is an excerpt of my AppManifest.xml:

<com:Extension Category="windows.comServer">
<com:ComServer>
<com:SurrogateServer>
<com:Class Id="cf1cbb8d-897c-45dc-b1a9-925201981d67" Path="VFS\ProgramFilesX64\MyApplication\shellext.dll" ThreadingModel="STA" />
</com:SurrogateServer>
</com:ComServer>
</com:Extension>
<desktop9:Extension Category="windows.fileExplorerClassicDragDropContextMenuHandler">
<desktop9:FileExplorerClassicDragDropContextMenuHandler>
<desktop9:ExtensionHandler Type="*" Clsid="cf1cbb8d-897c-45dc-b1a9-925201981d67" />
</desktop9:FileExplorerClassicDragDropContextMenuHandler>
</desktop9:Extension>

I tried to manually register the shell extension DLL from the main app code, eg with `LoadLibrary`, `GetProcAddress` for the `DllRegisterServer` function and calling `DllRegisterServer`.

I get no error but the registry entries are not created.

Is there support for copy hooker shell extensions with AppManifest.xml? Is there a workaround?

[1] https://learn.microsoft.com/en-us/uwp/schemas/appxpackage/uapmanifestschema/element-desktop9-extension