// ARCHIVE HEADER
  4 - Header (ZPKG)
  4 - Version (1)
  4 - First File Offset
  4 - Number Of Files In Directory 1
  4 - Directory 2 Offset
  4 - Number Of Files In Directory 2
  4 - Filename Directory Offset
  4 - Extension Directory Offset

  480 - null Padding to offset 512

// DIRECTORY 1
  // for each file in dir 1
    1 - null
    2 - File Extension Offset (relative to the start of the Extension Directory)
    1 - null
    4 - Filename Offset (relative to the start of the Filename Directory)
    4 - File Offset
    4 - File Length?

// DIRECTORY 2
  // I am not sure what this directory represents, but the junk chars make up a string
  // when added together, where the string represents directory names and general words

  // for each file in dir 2
    1 - Junk char
    1 - null
    4 - Unknown
    2 - File ID (incremental from 1)
    4 - Unknown

// FILENAME DIRECTORY
  1 - null

  // for each filename
    X - Filename
    1 - null

// EXTENSION DIRECTORY  
  1 - null

  // for each extension
    X - Extension Name
    1 - null

// FILE DATA
  // for each file
    X - File Data