WoWMapper .mesh to .obj conversion

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;

public class MeshConvert : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        CreateOBJFile();
    }

    public void CreateOBJFile() {
        Debug.Log("Creating OBJFile.");

        System.IO.BinaryReader reader = new BinaryReader(File.Open("D:/Games/WorldofWarcraft3.3.5a/wowmapper/bin/29_48.mesh", FileMode.Open)); // stormwind

        System.IO.TextWriter tw = new System.IO.StreamWriter("D:/Games/WorldofWarcraft3.3.5a/wowmapper/bin/stormwind.obj");

        reader.ReadBytes(32); //jump over BBX
        reader.ReadBytes(16); //jump over ADT

        // INDICES
        reader.ReadChars(3);
        reader.ReadByte();
        UInt32 indexSize = reader.ReadUInt32();
        int[] indexes = new int[indexSize];
        for (int i = 0; i < indexSize; i++) {
            indexes[i] = (int)(reader.ReadInt32() + 1);
        }

        Console.WriteLine("Done with saving indices.");

        // write VERTICES
        reader.ReadChars(3);
        reader.ReadByte();

        UInt32 vertexSize = reader.ReadUInt32();
        for (int i = 0; i < vertexSize; i++) {
            tw.WriteLine("v " + reader.ReadSingle() + " " + reader.ReadSingle() + " " + reader.ReadSingle());
        }

        Console.WriteLine("Done with writing vertices.");

        // write INDICES
        for (int i = 0; i < indexSize;) {
            tw.WriteLine("f " + indexes[i++] + " " + indexes[i++] + " " + indexes[i++]);
        }

        Console.WriteLine("Done with writing indices.");

        tw.Close();

        Console.WriteLine("Done.");
    }
}