Bug #1697782: remove all remaining code that uses types.InstanceType.
diff --git a/Lib/plat-mac/findertools.py b/Lib/plat-mac/findertools.py
index 282cc27..6c12419 100644
--- a/Lib/plat-mac/findertools.py
+++ b/Lib/plat-mac/findertools.py
@@ -484,8 +484,8 @@
     openwindow(fsr)
     if not pos:
         return _getwindowposition(folder_alias)
-    if type(pos) == InstanceType:
-        # pos might be a QDPoint object as returned by _getwindowposition
+    if aetypes.IsQDPoint(pos):
+        # QDPoint object as returned by _getwindowposition
         pos = (pos.h, pos.v)
     return _setwindowposition(folder_alias, pos)