[Python] How to create an "Open file" dialog box in Python for a GIMP 3 plugin with GIMP 3...

I recently got into the world of plugins for GIMP 3, but I have a good knowledge of Python programming. I'm creating a plugin where I need to select .txt files to extract some information. Since I know practically nothing about GIMP 3's functions, methods, classes and packages, I've been using AI to perform some code snippets. The problem I'm currently facing is that I have this code below to create the .txt file selection window, but the window has the native graphic style of the operating system I'm using (Ubuntu). I saw something about defining the parent window in GIMP and inheriting its graphic style, but I can't do that at all. Could someone give me a tip on what to do in my code to make this work or is it not possible? I've tried codes that used get_main_window but I get the error "'gi.repository.Gimp' object has no attribute 'get_main_window'"

def select_txt_file(parent_window=None):
# Create file selection window
dialog = Gtk.FileChooserDialog(
title="Select a text file",
action=Gtk.FileChooserAction.OPEN,
buttons=(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
Gtk.STOCK_OPEN, Gtk.ResponseType.OK)
)

# Filter for .txt files
filter_txt = Gtk.FileFilter()
filter_txt.set_name("Text files")
filter_txt.add_pattern("*.txt")
dialog.add_filter(filter_txt)

# Run dialog and get response
response = dialog.run()
filename = None

if response == Gtk.ResponseType.OK:
filename = dialog.get_filename()

dialog.destroy()

return filename

Continue reading...