def select_file(self): path = filedialog.askopenfilename(filetypes=[("OBJ files", "*.obj")]) if path: self.obj_path = path self.file_label.config(text=path, fg="green") self.convert_btn.config(state=tk.NORMAL)

If you prefer modern, open-source software, is the way to go. However, Blender does not support DFF natively. You will need an exclusive plugin called DragonFF or the GTA Tools suite. Why use Blender?