static void AppendToFile(string filename, string text)
{
SaveGame.EnsureStorageFolderExists(Game.SAVEGAMEFOLDER);
var Directory = SaveGame.UserStorageFolder(Game.SAVEGAMEFOLDER);
var Path = System.IO.Path.Combine(Directory, filename);
using (var w = File.AppendText(Path))
{
w.WriteLine(text);
}
}