diff --git a/network_sketcher.py b/network_sketcher.py
index f3e025c..f347cdf 100644
--- a/network_sketcher.py
+++ b/network_sketcher.py
@@ -759,6 +759,8 @@ def click_action_sub(self, click_value, target_area_name):
             ### Write VPNs on L1 ###
             ns_vpn_diagram_create.ns_write_vpns_on_l1.__init__(self)
 
+            ns_def.messagebox_file_open(self.output_ppt_file) #Add at Ver 2.3.1(a)
+
         if click_value == 'self.self.sub2_6_button_2':  # Click "VPN only"
             print('--- Click "VPN only ---')