注册表操作疑问

以下代码为何老是出现： PermissionError: [WinError 5] 拒绝访问 异常？

import winreg as reg

def proReg():

subkey = '*\shell'
key = reg.OpenKey(reg.HKEY_CLASSES_ROOT,subkey)
with key:
    reg.SetValue(key,'runas',reg.REG_SZ,'TEST')   # 这里抛出异常
    with reg.OpenKey(key,'runas',0,reg.KEY_WRITE) as nkey:
        reg.SetValueEx(nkey,'NoWorkingDirectory',0,reg.REG_SZ,'')

if name == 'main':

   proReg()