This reads a rFactor 1 VEH file using Python's built-in human interface library, tkinter. See the above article Standalone Python for more info.

from tkinter import *
from tkinter import ttk

import tkinter.messagebox as tkMessageBox
import tkinter.simpledialog as tkSimpleDialog
import tkinter.filedialog as tkFileDialog
import os

root = Tk()
root.title("Read VEH File")

# create a textarea
text = Text(root, width=1, height=1)
text.pack(fill=BOTH, expand=1)
root.geometry('500x400')

############SELECT FILE#################
def fileselect():
    filename = tkFileDialog.askopenfilename()

    if filename:
        data_file = open(filename, 'r')
        text.delete(1.0,END)
        
        for line in data_file:
            
            if (line.startswith('//')):                         #if single line comment
                print (line.rstrip("\r\n"))
                text.insert(INSERT, line)
                
            elif(line.startswith('\n')):                        #if blank line
                print (line.rstrip("\r\n"))
                text.insert(INSERT, line)
                
            else:                                               #if useful info
                key, val = line.split('=',1)
                if (val.find('//') >= 0):
                    cleanValue, comment = val.rsplit('//')
                    value = cleanValue.strip()
                    comment = '\t\t//'+comment.rstrip('\r\n')
                else:
                    value = val.strip()
                    comment = ''
                
                rewrite_file = key+'='+value+' '+comment
                print (rewrite_file)
                text.insert(INSERT, rewrite_file+'\n')

    else:
        tkMessageBox.showwarning("No", "You did it wrong")
        
        
def windowclose():
    # if tkMessageBox.askokcancel("Quit", "Do you really wish to quit?"):
    root.destroy()


###########INPUT DATA################
def inputdata():
    x = tkSimpleDialog.askinteger("Input","Multiplier")
    if x:
        tkMessageBox.showwarning("Yes",x)
        listbox.insert(END, x)
    else:
        tkMessageBox.showwarning("No","You did it wrong")
        
def tempwindow2():
    tkMessageBox.showwarning("Hi","close me")
    
def myAboutCmd():
    tkMessageBox.showwarning("About Me","close me")



#######################MENU#################
menu = Menu(root)
root.config(menu=menu)

filemenu = Menu(menu)
menu.add_cascade(label="File", menu=filemenu)
filemenu.add_command(label="Open", command=fileselect)
filemenu.add_command(label="Quit", command=windowclose)

editmenu = Menu(menu)
menu.add_cascade(label="Edit", menu=editmenu)
editmenu.add_command(label="Input", command=inputdata)

helpmenu = Menu(menu)
menu.add_cascade(label="Help", menu=helpmenu)
helpmenu.add_command(label = "About", command=tempwindow2)

root.mainloop()