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App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

Form1.cs

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+using System;
+using System.IO;
+using System.Linq;
+using System.Windows.Forms;
+
+namespace mergevehiclesfivem
+{
+    public partial class Form1 : Form
+    {
+        private string vehicleFolderPath = string.Empty;
+        private string outputFolderPath = string.Empty;
+
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        private void Form1_Load(object sender, EventArgs e)
+        {
+
+        }
+
+        private void button2_Click(object sender, EventArgs e)
+        {
+            using (FolderBrowserDialog folderDialog = new FolderBrowserDialog())
+            {
+                folderDialog.Description = "Select the folder containing the vehicles";
+                folderDialog.ShowNewFolderButton = false;
+                folderDialog.SelectedPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
+
+                if (folderDialog.ShowDialog() == DialogResult.OK)
+                {
+                    vehicleFolderPath = folderDialog.SelectedPath;
+                    MessageBox.Show($"Vehicle folder selected: {vehicleFolderPath}", "Folder Selected", MessageBoxButtons.OK, MessageBoxIcon.Information);
+                }
+            }
+        }
+
+        private void button3_Click(object sender, EventArgs e)
+        {
+            using (FolderBrowserDialog folderDialog = new FolderBrowserDialog())
+            {
+                folderDialog.Description = "Select the output folder";
+                folderDialog.ShowNewFolderButton = true;
+                folderDialog.SelectedPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
+
+                if (folderDialog.ShowDialog() == DialogResult.OK)
+                {
+                    outputFolderPath = folderDialog.SelectedPath;
+                    MessageBox.Show($"Output folder selected: {outputFolderPath}", "Folder Selected", MessageBoxButtons.OK, MessageBoxIcon.Information);
+                }
+            }
+        }
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            if (string.IsNullOrEmpty(vehicleFolderPath) || string.IsNullOrEmpty(outputFolderPath))
+            {
+                MessageBox.Show("Please select both folders before proceeding.", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                return;
+            }
+
+            if (string.IsNullOrEmpty(textBox1.Text))
+            {
+                MessageBox.Show("Please enter a valid name for the folder");
+                return;
+            }
+
+            string mergedFolder = Path.Combine(outputFolderPath, textBox1.Text);
+            string streamFolder = Path.Combine(mergedFolder, "stream");
+            string dataFolder = Path.Combine(mergedFolder, "data");
+
+            if (!Directory.Exists(mergedFolder))
+            {
+                Directory.CreateDirectory(mergedFolder);
+            }
+
+            if (!Directory.Exists(streamFolder))
+            {
+                Directory.CreateDirectory(streamFolder);
+            }
+
+            if (!Directory.Exists(dataFolder))
+            {
+                Directory.CreateDirectory(dataFolder);
+            }
+
+            GenerateManifest(mergedFolder);
+
+            foreach (var vehicleDir in Directory.GetDirectories(vehicleFolderPath))
+            {
+                string vehicleName = Path.GetFileName(vehicleDir);
+                string vehicleStreamFolder = Path.Combine(streamFolder, vehicleName);
+                string vehicleDataFolder = Path.Combine(dataFolder, vehicleName);
+
+                Directory.CreateDirectory(vehicleStreamFolder);
+                Directory.CreateDirectory(vehicleDataFolder);
+
+                foreach (var subDir in Directory.GetDirectories(vehicleDir))
+                {
+                    string subDirName = Path.GetFileName(subDir).ToLower();
+
+                    if (subDirName == "stream")
+                    {
+                        ProcessStreamDirectory(subDir, vehicleStreamFolder);
+                    }
+                    else
+                    {
+                        ProcessMetaDirectory(subDir, vehicleDataFolder);
+                    }
+                }
+
+                foreach (var file in Directory.GetFiles(vehicleDir))
+                {
+                    string fileName = Path.GetFileName(file);
+                    string extension = Path.GetExtension(file).ToLower();
+
+                    if (extension == ".meta")
+                    {
+                        File.Copy(file, Path.Combine(vehicleDataFolder, fileName), true);
+                    }
+                    else
+                    {
+                        File.Copy(file, Path.Combine(vehicleStreamFolder, fileName), true);
+                    }
+                }
+            }
+
+            MessageBox.Show("Merge completed. All files have been combined.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
+        }
+
+        private void ProcessStreamDirectory(string currentDir, string vehicleStreamFolder)
+        {
+            foreach (var file in Directory.GetFiles(currentDir))
+            {
+                string fileName = Path.GetFileName(file);
+                string extension = Path.GetExtension(file).ToLower();
+
+                File.Copy(file, Path.Combine(vehicleStreamFolder, fileName), true);
+            }
+
+            foreach (var subDir in Directory.GetDirectories(currentDir))
+            {
+                ProcessStreamDirectory(subDir, vehicleStreamFolder);
+            }
+        }
+
+        private void ProcessMetaDirectory(string currentDir, string vehicleMetaFolder)
+        {
+            foreach (var file in Directory.GetFiles(currentDir))
+            {
+                string fileName = Path.GetFileName(file);
+                string extension = Path.GetExtension(file).ToLower();
+
+                File.Copy(file, Path.Combine(vehicleMetaFolder, fileName), true);
+            }
+
+            foreach (var subDir in Directory.GetDirectories(currentDir))
+            {
+                ProcessStreamDirectory(subDir, vehicleMetaFolder);
+            }
+        }
+
+        private void GenerateManifest(string outputFolder)
+        {
+            string manifestFile = Path.Combine(outputFolder, "fxmanifest.lua");
+
+            using (StreamWriter writer = new StreamWriter(manifestFile))
+            {
+                writer.WriteLine("fx_version 'adamant'");
+                writer.WriteLine("game 'gta5'");
+                writer.WriteLine("");
+                writer.WriteLine("files {\r\n'data/**/*.meta',\r\n}");
+                writer.WriteLine("");
+                writer.WriteLine("data_file 'VEHICLE_METADATA_FILE' 'vehicles.meta'");
+                writer.WriteLine("data_file 'CARCOLS_FILE' 'carcols.meta'");
+                writer.WriteLine("data_file 'VEHICLE_VARIATION_FILE' 'carvariations.meta'");
+                writer.WriteLine("data_file 'HANDLING_FILE' 'handling.meta'");
+                writer.WriteLine("data_file 'VEHICLE_LAYOUTS_FILE' 'vehiclelayouts.meta'");
+            }
+        }
+
+        private void textBox1_TextChanged(object sender, EventArgs e)
+        {
+            Console.WriteLine(textBox1.Text);
+        }
+    }
+}