diff --git a/DemoPrograms/Demo_CLI_or_GUI.py b/DemoPrograms/Demo_CLI_or_GUI.py
new file mode 100644
index 00000000..78996580
--- /dev/null
+++ b/DemoPrograms/Demo_CLI_or_GUI.py
@@ -0,0 +1,26 @@
+"""
+    Demo Command Line Application or GUI Application
+
+    If your program is run with arguments, then a command line version is used.
+    If no arguments are given, then a GUI is shown that asks for a filename.
+
+    http://www.PySimpleGUI.org
+    Copyright 2022 PySimpleGUI
+"""
+
+import PySimpleGUI as sg
+import sys
+
+def main_cli(filename):
+    print(f'Your filename = {filename}')
+
+
+def main_gui():
+    filename = sg.popup_get_file('Please enter a filename:')
+    main_cli(filename)
+
+if __name__ == '__main__':
+    if len(sys.argv) < 2:
+        main_gui()
+    else:
+        main_cli(sys.argv[1])