Use C# code as below

string path = @"Folder Path";

            DirectoryInfo di = new DirectoryInfo(path);

            FileInfo[] fiArray = di.GetFiles();

            Array.Sort(fiArray, (x , y) => StringComparer.OrdinalIgnoreCase.Compare(x.LastWriteTime, y.LastWriteTime));

            string LatestFile = fiArray[fiArray.Length-1].ToString();