Index: Include/windows/WindowHandle.sbp
===================================================================
--- Include/windows/WindowHandle.sbp	(revision 223)
+++ Include/windows/WindowHandle.sbp	(revision 237)
@@ -374,5 +374,5 @@
 	Const Function ScreenToClient(ByRef rc As RECT) As Boolean
 		Dim ppt = VarPtr(rc) As *POINTAPI
-		Return _System_ScreenToClient(hwnd, ppt[0]) And _System_ScreenToClient(hwnd, ppt[1])
+		Return (_System_ScreenToClient(hwnd, ppt[0]) <> FALSE And _System_ScreenToClient(hwnd, ppt[1]) <> FALSE) As Boolean
 	End Function