Tkinter object-oriented file dialog?

Question

The following code displays a file dialog, returning a file_path string that I may then use to, for example, import a csv directly into a pandas dataframe.

utilities.py:

import tkinter as tk
from tkinter import filedialog as fd


class FileDialog(tk.Tk): # inherits from the tk.Tk class

    def __init__(self):
        super().__init__()
        self.withdraw() # prevents Tkinter window from displaying

    def open(self):
        return fd.askopenfilename()

    def saveas(self):
        return fd.asksaveasfilename()

main.py:

import utilities as util


file_path = util.FileDialog().open()

I am teaching myself advanced programming concepts such as inheritance and the self keyword, and am requesting feedback on whether I am applying these ideas correctly. Thank you for your time.