using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var input = @"[""gm-63.pdf"",""GM413.pdf"",""mh524.pdf""]";

        var result = input.Trim('[', ']').Split(new[]{','}).Select(x => x.Trim('"')).ToArray();

        foreach (var item in result)

            Console.WriteLine(item);

    }

}