using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string text = "Files[Some File 1 [0100152000022000][v0].txt[7268474425]Some File Two [0100152000022800][v720896].txt[661204928]Some File Three [Extra Info Ignored][0100152000023001][v0].txt[121034]]";

        text = text.Substring(6);

        text = text.Substring(0, text.Length - 1);

        var split = Regex.Split(text, "\\.txt\\[\\d+?\\]");

        foreach (var item in split)

            Console.WriteLine(item);

    }

}