diff --git a/src/TeamsISO.App.WinUI/TeamsISO.App.WinUI.csproj b/src/TeamsISO.App.WinUI/TeamsISO.App.WinUI.csproj
index 2aaff00..e4c05f5 100644
--- a/src/TeamsISO.App.WinUI/TeamsISO.App.WinUI.csproj
+++ b/src/TeamsISO.App.WinUI/TeamsISO.App.WinUI.csproj
@@ -55,6 +55,14 @@
       Main and calls Bootstrap.TryInitialize(0x00010006) before Start.
     -->
     <DefineConstants>$(DefineConstants);DISABLE_XAML_GENERATED_MAIN</DefineConstants>
+    <!--
+      RuntimeIdentifier locks the build to win-x64 so runtime DLLs from
+      runtimes/win-x64/native (Microsoft.WindowsAppRuntime.Bootstrap.dll,
+      WebView2Loader.dll) flatten into the output dir alongside the .exe.
+      Without this, those DLLs sit in runtimes/win-x64/native/ and the
+      loader doesn't find them at activation time.
+    -->
+    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <ApplicationIcon>Assets\teamsiso.ico</ApplicationIcon>