Directory.SetCurrentDirectory(@"C:\"); Directory.CreateDirectory(@"C:\はげ\"); Directory.CreateDirectory(@"C:\まげ\"); Directory.CreateDirectory(@"C:\まげ\はげ\"); File.WriteAllText(@"C:\はげ\ひげ.TXT", "100"); File.WriteAllText(@"C:\まげ\はげ\ひげ.TXT", "200"); Directory.SetCurrentDirectory(@"C:\まげ"); string s1 = File.ReadAllText(@"C:はげ\ひげ.TXT"); // 200 string s2 = File.ReadAllText(@"C:\はげ\ひげ.TXT"); // 100