diff --git a/include/Makefile.in b/include/Makefile.in
index 115da5bd080..32ef2cd41c1 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -754,6 +754,7 @@ SOURCES = \
 	windows.gaming.input.idl \
 	windows.h \
 	windows.media.speechsynthesis.idl \
+	windows.system.idl \
 	windowscontracts.idl \
 	windowsx.h \
 	wine/debug.h \
diff --git a/include/windows.system.idl b/include/windows.system.idl
new file mode 100644
index 00000000000..aaf5ecd69a1
--- /dev/null
+++ b/include/windows.system.idl
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2021 Rémi Bernon for CodeWeavers
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef __WIDL__
+#pragma winrt ns_prefix
+#endif
+
+import "inspectable.idl";
+import "asyncinfo.idl";
+import "eventtoken.idl";
+import "windowscontracts.idl";
+import "windows.foundation.idl";
+
+namespace Windows {
+    namespace System {
+        interface IUser;
+        interface IUserStatics;
+        interface IUserChangedEventArgs;
+        interface IUserChangedEventArgs2;
+        runtimeclass User;
+        runtimeclass UserChangedEventArgs;
+    }
+}
+
+namespace Windows {
+    namespace System {
+        [
+            contract(Windows.Foundation.UniversalApiContract, 1.0),
+            exclusiveto(Windows.System.UserChangedEventArgs),
+            uuid(086459dc-18c6-48db-bc99-724fb9203ccc)
+        ]
+        interface IUserChangedEventArgs : IInspectable
+        {
+            [propget] HRESULT User([out, retval] Windows.System.User** value);
+        }
+
+        [
+            contract(Windows.Foundation.UniversalApiContract, 1.0),
+            marshaling_behavior(agile),
+            static(Windows.System.IUserStatics, Windows.Foundation.UniversalApiContract, 1.0),
+            threading(both),
+        ]
+        runtimeclass User
+        {
+            [default] interface Windows.System.IUser;
+        }
+
+        [
+            contract(Windows.Foundation.UniversalApiContract, 1.0),
+            marshaling_behavior(agile)
+        ]
+        runtimeclass UserChangedEventArgs
+        {
+            [default] interface Windows.System.IUserChangedEventArgs;
+            [contract(Windows.Foundation.UniversalApiContract, 10.0)] interface Windows.System.IUserChangedEventArgs2;
+        }
+    }
+}