diff --git a/README.md b/README.md
index 1feb756..27ca75f 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,12 @@ See also the [Windows App SDK downloads](https://learn.microsoft.com/windows/app
 When the runtime is missing, the GUI offers to install it from the Microsoft Store
 (where the Store is available) or opens these downloads.
 
+On Windows builds before Windows 11 24H1, including Windows 10, the GUI also needs
+`Microsoft.WindowsAppRuntime.Bootstrap.dll` for the process architecture beside
+`enableLoopback.exe`. It ships in the `Microsoft.WindowsAppSDK.Foundation` 2.3.12
+NuGet package under `runtimes/win-<arch>/native/`; release packaging does not include
+it yet (#8).
+
 Build and run in Git Bash:
 
 ```sh
diff --git a/vendor/windows-rs b/vendor/windows-rs
index 7876e1b..d1574fd 160000
--- a/vendor/windows-rs
+++ b/vendor/windows-rs
@@ -1 +1 @@
-Subproject commit 7876e1bd6af4f4875d529d0cfed0aa58e70984f6
+Subproject commit d1574fd27371a9b08bc5508f70c43ccb4f84c543