diff --git a/reactos/win32ss/include/ntwin32.h b/reactos/win32ss/include/ntwin32.h
new file mode 100644
index 00000000000..d1c4ac46379
--- /dev/null
+++ b/reactos/win32ss/include/ntwin32.h
@@ -0,0 +1,16 @@
+
+#pragma once
+
+/* These are opaque for user mode */
+typedef struct _PROCESSINFO *PPROCESSINFO;
+typedef struct _THREADINFO *PTHREADINFO;
+
+typedef struct _W32CLIENTINFO
+{
+    ULONG CI_flags;
+    ULONG cSpins;
+    ULONG ulWindowsVersion;
+    ULONG ulAppCompatFlags;
+    ULONG ulAppCompatFlags2;
+    ULONG W32ClientInfo[57];
+} W32CLIENTINFO, *PW32CLIENTINFO;