437 error preventing me from unzipping files. PC version.

I used a script to unzip my files. It does not work when having built the project. The error is

NotSupportedException: Encoding 437 data could not be found. Make sure you have correct international codeset assembly installed and enabled.

Any help getting this to work, would be highly appreciated.

using UnityEngine;
using System.Collections;
using System;
using System.Runtime.InteropServices;
using Ionic.Zip;
using System.Text;
using System.IO;

public class ZipUtil

	public static void Unzip (string zipFilePath, string location)
		Directory.CreateDirectory (location);
        ReadOptions ops = new ReadOptions();
        ops.Encoding = Encoding.UTF8;
		using (ZipFile zip = ZipFile.Read (zipFilePath,ops)) {
			zip.ExtractAll (location, ExtractExistingFileAction.OverwriteSilently);

I haven’t tested this but it sounds like a similar problem as this → CodePage 1252 not supported - works in editor but not in standalone player - Questions & Answers - Unity Discussions.

It sounds like you need to make sure you have the correct DLL as part of the PC version build. Once you find the DLL add it to your project similar to this comment, http://answers.unity.com/answers/1157954/view.html and see if that fixes your problem.