diff --git a/reactos/include/psdk/idndl.h b/reactos/include/psdk/idndl.h
new file mode 100644
index 00000000000..b945c31ca07
--- /dev/null
+++ b/reactos/include/psdk/idndl.h
@@ -0,0 +1,18 @@
+#ifndef IDNDL_H_
+#define IDNDL_H_
+
+#include <windows.h>
+
+#ifndef GSS_ALLOW_INHERITED_COMMON
+#define GSS_ALLOW_INHERITED_COMMON 1
+#endif
+
+#ifndef VS_ALLOW_LATIN
+#define VS_ALLOW_LATIN 1
+#endif
+
+int WINAPI DownlevelGetLocaleScripts(LPCWSTR,LPWSTR,int);
+int WINAPI DownlevelGetStringScripts(DWORD,LPCWSTR,int,LPWSTR,int);
+BOOL WINAPI DownlevelVerifyScripts(DWORD,LPCWSTR,int,LPCWSTR,int);
+
+#endif