code: def gui_getFolder():
      
      import tkinter as tk
      from tkinter import filedialog
      root = tk.Tk() # this is natively supported by python
      root.withdraw() # hide main window
      root.wm_attributes('-topmost', 1) # always on top
      fname = filedialog.askdirectory(title = "select folder of ABFs",
                                         initialdir=os.path.dirname(abfFname_Load()))
      if len(fname)>3:
          abfFname_Save(fname+"/_._")
          return fname
      else:
          print("didn't select an ABF!")
          return None
docs: Launch a folder selection dialog.
      This is smart, and remembers (through reboots) where you last were.