using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
class Program
{
static void Main(string[] args)
{
var dic = new Dictionary<string,string>();
var files = Directory.GetFiles(@"(パス)", "*.*", SearchOption.AllDirectories);
foreach (var item in files)
{
dic[Path.GetExtension(item)] = item;
}
foreach (var item in dic.Keys)
{
Console.WriteLine(item);
}
}
}