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This is the specifications for the archive file which is handled by the Game Extractor plugin Archive_WAD_WWAD_2.

Endian Order:	Little Endian
Compression:	None
Encryption:	None

This format is used by the following Games:

Batman: Arkham City	*.wad
Batman: Arkham Origins	*.wad

This is the format specification information:

// ARCHIVE HEADER
  4 - Header (WWAD)
  2 - null
  2 - Unknown
  4 - Number of Files
  4 - Archive Header Length (28)
  4 - Details Directory Length
  4 - File Data Offset
  4 - File Data Length
  
// DETAILS DIRECTORY
  // for each file
    4 - Hash?
    4 - File Length (including Padding)
    4 - File Offset
    
  X - null Padding to a multiple of 2048? bytes
    
// FILE DATA
  // for each file
    X - File Data
    X - null Padding to a multiple of 2048? bytes

Game Extractor is able to read files of this type, as well as files from thousands of other games. To give it a try, download Game Extractor (Basic Version) for free, and see what it can do.

For further information on this format, refer to the source code on our GitHub repository.