Получение информации об учетной записи Windows - C#

[DllImport("shell32.dll", EntryPoint = "#261", CharSet = CharSet.Unicode, PreserveSig = false)]
public static extern void GetUserTilePath(
    string username, 
    UInt32 whatever, // 0x80000000
    StringBuilder picpath, int maxLength
);
 
// username: use null for current user
public static string GetUserTilePath(string username)
{   
    var sb = new StringBuilder(1000);
    GetUserTilePath(username, 0x80000000, sb, sb.Capacity);
    return sb.ToString();
}