A simple post processor for copying files from the assets/data folder to the player data folder in Unity3D

DataCopyProcessor.cs

using UnityEngine;
using UnityEditor;
using UnityEditor.Callbacks;
using System.Collections;
using System.IO;

public class DataCopyProcessor {
	[PostProcessBuild]
	public static void OnPostprocessBuild(BuildTarget target, string pathToBuiltProject) {
		
		string sourceFolder = Path.Combine(Application.dataPath, "Data/");
		string targetFolder = Path.Combine(pathToBuiltProject, "Data/");
		
		Debug.Log("Copying files from " + sourceFolder + " to " + targetFolder);
		
		string[] files = Directory.GetFiles(sourceFolder);
		
		foreach(string file in files)
		{
			string filename = Path.GetFileName(file);
			
			if(Path.GetExtension(filename) != ".meta")
			{
				Debug.Log("Copying " + filename + " to data folder...");
				File.Copy(Path.Combine(sourceFolder, filename), Path.Combine(targetFolder, filename));
			}
		}
	} 
}