Список результатов все пути

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Привет

Моя проблема заключается в том что когда я нажимаю кнопку программа ищет в папке файлы с расширением gz и результат помещается в список с форматом C:\Program файлы\новые Folder\Compressed.gz.
Я хочу, чтобы результат в ListBox был обрезан с помощью этого формата New Folder\Compressed.gr

Что я уже пробовал:

<pre>using Microsoft.VisualBasic;
using Microsoft.VisualBasic.CompilerServices;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml;

namespace SD
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private string fileName;

        private void Form1_Load(object sender, EventArgs e)
        {
            //List<string> filenames = FindFiles(path.Text, exten.Text, check.Checked);
            //lstFiles.Items.Clear();
            //foreach (string filename in filenames)
            //{
            //    lstFiles.Items.Add(filename);
            //}
            this.KeyPreview = true;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            
            List<string> filenames = FindFiles(path.Text, exten.Text, check.Checked);
            lstFiles.Items.Clear();
            foreach (string filename in filenames)
            {
                lstFiles.Items.Add(filename);
                
            }
            
        }
        private List<string> FindFiles(string dir_name, string patterns, bool search_subdirectories)
        {
            
            List<string> files = new List<string>();
            string[] pattern_array = patterns.Split(';');
            SearchOption search_option = SearchOption.AllDirectories;
            foreach (string pattern in pattern_array)
            {
                foreach (string filename in Directory.GetFiles(dir_name, pattern, search_option))
                {
                    if (!files.Contains(filename)) files.Add(filename);
                }
            }
            label1.Text = files.Count.ToString();
            files.Sort();
            return files;
        }
        private void lstFiles_SelectedIndexChanged(object sender, EventArgs e)
        {
            
        }
        private byte[] DecompressArray(byte[] content)
        {
            byte[] array;
            int num;
            using (MemoryStream memoryStream = new MemoryStream())
            {
                using (MemoryStream memoryStream1 = new MemoryStream(content))
                {
                    using (GZipStream gZipStream = new GZipStream(memoryStream1, CompressionMode.Decompress))
                    {
                        byte[] numArray = new byte[1024];
                        do
                        {
                            num = gZipStream.Read(numArray, 0, (int)numArray.Length);
                            memoryStream.Write(numArray, 0, num);
                        }
                        while (num > 0);
                    }
                }
                array = memoryStream.ToArray();
            }
            return array;
        }
        private void UnzipDirectory(byte[] compressed, string outputPath)
        {
            IEnumerator enumerator = null;
            IEnumerator enumerator1 = null;
            if (!Directory.Exists(outputPath))
            {
                Directory.CreateDirectory(outputPath);
            }
            byte[] numArray = this.DecompressArray(compressed);
            XmlDocument xmlDocument = new XmlDocument();
            using (MemoryStream memoryStream = new MemoryStream(numArray))
            {
                xmlDocument.Load(memoryStream);
                XmlNode firstChild = xmlDocument.FirstChild;
                XmlNode xmlNodes = firstChild.FirstChild;
                XmlNode nextSibling = firstChild.FirstChild.NextSibling;
                try
                {
                    enumerator = xmlNodes.ChildNodes.GetEnumerator();
                    while (enumerator.MoveNext())
                    {
                        object objectValue = RuntimeHelpers.GetObjectValue(enumerator.Current);
                        Directory.CreateDirectory(Path.Combine(outputPath, ((XmlNode)objectValue).Attributes.Item(0).Value));
                    }
                }
                finally
                {
                    if (enumerator is IDisposable)
                    {
                        (enumerator as IDisposable).Dispose();
                    }
                }
                try
                {
                    enumerator1 = nextSibling.ChildNodes.GetEnumerator();
                    while (enumerator1.MoveNext())
                    {
                        object obj = RuntimeHelpers.GetObjectValue(enumerator1.Current);
                        string str = Path.Combine(outputPath, ((XmlNode)obj).Attributes.Item(0).Value);
                        byte[] numArray1 = Convert.FromBase64String(((XmlNode)obj).InnerText);
                        File.WriteAllBytes(str, numArray1);
                    }
                }
                finally
                {
                    if (enumerator1 is IDisposable)
                    {
                        (enumerator1 as IDisposable).Dispose();
                    }
                }
            }
        }
        private void lstFiles_DoubleClick(object sender, EventArgs e)
        {
            if (lstFiles.SelectedItem != null)
            {
                fileName = lstFiles.SelectedItem.ToString();
                FileInfo fileInfo = new FileInfo(fileName);
                try
                {
                    if (File.Exists(fileName))
                    {
                        UnzipDirectory(File.ReadAllBytes(fileName), fileInfo.DirectoryName);
                        File.Delete(fileName);
                    }
                }
                catch (Exception exception)
                {
                    ProjectData.SetProjectError(exception);
                    Interaction.MsgBox("ERROR Please run program as Administrator", MsgBoxStyle.Critical,  null);
                    ProjectData.ClearProjectError();
                    return;
                }
                Interaction.MsgBox("Task Complete", MsgBoxStyle.Information, null);
                button1.PerformClick();
            }
        }
        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Control == true && e.KeyCode == Keys.S)
            {
                path.Visible = true;
            }
            if (e.Control == true && e.KeyCode == Keys.W)
            {
                path.Visible = false;
            }
        }
    }
}

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