Как отсортировать файлы по дате в имени?

var path = @"C:\Users\admin\Desktop\1\DBCommanderNew\bin\Debug";
var files = Directory
    .GetFiles(path,"*.xls")
    .Select(x => Path.GetFileNameWithoutExtension(x))
    .OrderBy(x => 
        {
            DateTime date;
            return DateTime.TryParseExact(x, "dd.MM.yy", CultureInfo.InvariantCulture, DateTimeStyles.None, out date)
                ? date
                : DateTime.MinValue;
        }).ToList();

C# 7:

    {
        var path = @"C:\Users\admin\Desktop\1\DBCommanderNew\bin\Debug";
        var files = Directory.GetFiles(path, "*.xls")
            .Select(x => Selector(x))
            .OrderBy(x => x.Item2.Date)
            .Select(x => x.Item1)
            .ToList();
    }
    private static (string, DateTime) Selector(string input)
    {
        var file = Path.GetFileNameWithoutExtension(input);
        if (DateTime.TryParse(file, out DateTime dateTime))
            return (file, dateTime);
        return (file, DateTime.MinValue);
    }

C# 6:

    {
        var path = @"C:\Users\admin\Desktop\1\DBCommanderNew\bin\Debug";
        var files = Directory.GetFiles(path, "*.xls")
            .Select(x => Selector(x))
            .OrderBy(x => x.Item2.Date)
            .Select(x => x.Item1)
            .ToList();
    }
    private static Tuple<string, DateTime> Selector(string input)
    {
        var file = Path.GetFileNameWithoutExtension(input);
        DateTime dt;
        if (DateTime.TryParse(file , out dt))
            return Tuple.Create(file, dt);
        return Tuple.Create(file, DateTime.MinValue);
    }