Bug: Cannot launch folder pickers in LowIL mode (partial trust)

Description

When running a WinUI 3 app in lowIL mode (as UWP does), you cannot call he folder pickers.

System.UnauthorizedAccessException when trying to use WinRT.Interop.InitializeWithWindow.Initialize(folderPicker, hwnd);

This is because hwnd is not allowed in LowIL mode.

This prevents UWP migration.

Steps To Reproduce

WinRT.Interop.InitializeWithWindow.Initialize(folderPicker, hwnd);

Expected Behavior

This line is only required because of the implementation of the MainWindow and is for interrop. But doesn't provide for the high security requirements of LowIL mode.

I expect he pickers to launch

We know this doesn't work for admin mode (privelaged access) either and the WASDK team have created a new API specifically for that. But that new API also doesn't work in low privelage mode.

Version Info

WASDK 1.7
csWinRT 2.2

Additional Context

No response

Start by investigating the WinRT.Interop.InitializeWithWindow.Initialize(folderPicker, hwnd) entry point and how folder pickers are activated in lowIL mode. Reproduce the UnauthorizedAccessException under lowIL and compare the behavior with the documented privileged-mode picker API. Done means folder pickers launch successfully in lowIL without violating its security restrictions.