Add an empty file to the Registry

main.py

import winreg
import ctypes
import os


keys = [
    r'.dwg\ShellNew',
    r'.3dm\ShellNew',
    r'.blend\ShellNew']


def set_reg(key, value_name, value):
    try:
        winreg.CreateKey(winreg.HKEY_CLASSES_ROOT, key)
        with winreg.OpenKey(winreg.HKEY_CLASSES_ROOT, key, 0, winreg.KEY_WRITE) as f:
            winreg.SetValueEx(f, value_name, 0, winreg.REG_SZ, value)
            return True
    except WindowsError:
        return False


def get_reg(key, value_name):
    try:
        with winreg.OpenKey(winreg.HKEY_CLASSES_ROOT, key) as f:
            value, regtype = winreg.QueryValueEx(f, value_name)
            return True
    except WindowsError:
        return None

try:
    is_admin = os.getuid() == 0  # Also `os.geteuid()` for executable.
except AttributeError as e:
    is_admin = ctypes.windll.shell32.IsUserAnAdmin() != 0

if is_admin:
    restart = False
    for i in keys:
        if get_reg(i, 'NullFile'):
            print(i + ' was set!')
        else:
            set_reg(i, 'NullFile', '1')
            print(i + ' is set!')
            restart = True
    if restart:
        print('Restart your system!')
else:
    print('You don\'t have admin permission!')