ApplicationData.Current.RoamingSettings

我有一个windows 8.1应用程序，它正在使用此代码加载应用程序的以前状态：

    ApplicationDataContainer roamingSettings = ApplicationData.Current.RoamingSettings;
    if (roamingSettings.Values.ContainsKey("userName"))
    {
        nameInput.Text = roamingSettings.Values["userName"].ToString();
    }

漫游设置存储在此处：

C： ''Users''username''AppData''Local''Packages''87bfb6d3-2d15-43bb-8f52-7ee30bdd4c4e_c7a7mhx3d14p''Settings''Settings.dat

我以管理员身份运行regedit.exe，打开settings.dat文件并更改了"userName"值，但当我再次运行该应用程序时，我得到了以下异常：

An exception of type 'System.Exception' occurred in HelloWorld.exe but was not handled in user code
WinRT information: Error trying to initialize the application data container server
Additional information: Loading the state store failed.

为什么它不允许我直接从settings.dat文件更改用户名？