Add link to Microsoft docs for limitations in Windows Store package (GH-24422)

(cherry picked from commit 1ba08a1)

Co-authored-by: Steve Dower <[email protected]>

Author: miss-islington

Doc/using/windows.rst

@@ -339,6 +339,11 @@ full write access to shared locations such as ``TEMP`` and the registry.
 Instead, it will write to a private copy. If your scripts must modify the
 shared locations, you will need to install the full installer.
 
+For more detail on the technical basis for these limitations, please consult
+Microsoft's documentation on packaged full-trust apps, currently available at
+`docs.microsoft.com/en-us/windows/msix/desktop/desktop-to-uwp-behind-the-scenes
+<https://docs.microsoft.com/en-us/windows/msix/desktop/desktop-to-uwp-behind-the-scenes>`_
+
 
 .. _windows-nuget: