import winreg

You're looking to write a proper feature for FL Studio 12's registry key.

def read_license_key(): try: key = winreg.OpenKey(winreg.HKEY_CURRENT_USER, r"Software\Image-Line\FL Studio") license_key, value_type = winreg.QueryValueEx(key, "License") print(f"License Key: {license_key}") except Exception as e: print(f"Error: {e}")