File structure of the exported WebGL data file and to extract script files from it

After building my project for WebGL I noticed that all the assets files are bundled in a single data file "TEST.data" which will be loaded by the player to construct the game. So, I used binwalk to look around the structure of this file, and this is what I found:

 $ binwalk TEST.data                                                     ‹system›
 
 DECIMAL       HEXADECIMAL     DESCRIPTION
 --------------------------------------------------------------------------------
 1260155       0x133A7B        MySQL ISAM index file Version 4
 18449498      0x119845A       Base64 standard index table
 18526213      0x11AB005       Copyright string: "CopyrightAttribute"
 18781094      0x11E93A6       mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 8bit
 19519556      0x129D844       Base64 standard index table
 19535472      0x12A1670       SHA256 hash constants, little endian
 19907146      0x12FC24A       ARJ archive data, header size: 0, version 3, minimum version to extract: 1, backup, compression method: compressed faster, file type: binary, original file date: 1970-01-01 18:30:56, compressed file size: 68448, uncompressed file size: 69216, os: MS-DOS
 20044630      0x131DB56       mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: 4bit
 20205766      0x13450C6       mcrypt 2.2 encrypted data, algorithm: blowfish-448, mode: CBC, keymode: MD5 hash
 20635384      0x13ADEF8       Copyright string: "copyright (c) 2010 Google Corporation. "
 20635424      0x13ADF20       Copyright string: "Copyright (c) 2012 Red Hat, Inc."
 21983375      0x14F708F       XML document, version: "1.0"
 

So I tried to extract the ARJ file as it seems to contain the script files but it was corrupted. Please any one knows the process of creating the data file and how assets are bundled in it.