This is the specifications for the archive file which is handled by the Game Extractor plugin Archive_ARK_3.

Endian Order:Little Endian
Compression:None
Encryption:None


This format is used by the following Games:
Guitar Hero [PS2]*.ark *.hdr


This is the format specification information:
 
// HDR FILE

4 - Number Of Directoies (3)
4 - Version Major (1)
4 - Version Minor (1)
4 - Archive Length

// FILENAME DIRECTORY
  4 - Filename Directory Length (not including this field)

  // for each file
    X - Filename
    1 - null Filename Terminator

// FILENAME OFFSETS DIRECTORY
  4 - Number Of Files And Folders

  // for each file and folder
    4 - Filename Offset (relative to the start of the filename directory)

// FILES DIRECTORY
  4 - Number Of Files

  // for each file
    4 - File Offset
    4 - Filename Number
    4 - Directory Name Number
    4 - File Length
    4 - null


These are the accompanying notes and further information:
 
There is only 1 ark file, and it has a directory called main.hdr (which is not quite the same name as the archive, which is main_0.ark)
The first filename is empty.


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.