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                                                Galactic Civilizations .MTD File Format Hacked					
                                                       Researched by Dark Rain / Black Heaven
                                                                     (rochdenis@hotmail.com)

 v0.0.6
 ======

 Introduction to MTD files
 =========================

 MTD files are an archive format for various Pear medias. A MTD file can in 
 theory contain any type of data but there's only 4 type supported by Mutil, 
 they're PAL_, SPR1, tiles and incl (don't ask me what incl is).

 The MTD extension is short for Michael T. Duffy. It's the name of the author of the
 pear library. The library was used extensively to create Galactic Civilizations.
 You can visit his website at : "http://www.ionet.net/~mduffy/". 

 In GalCiv, the programmers used various extensions beside mtd but it's still the
 same file format. So far, I've identified .mdl and .tiles files as being mtd 
 compatible files.

 In the context of the pear library, each MTD file is refered to as a library 
 and each file in it as a book. I will use this analogy too to prevent
 confusion but dont forget that it's just files in an archive like a zip.

 I have to thank CariElf and MadMaz for the hints regarding the general
 structure of the mdl files. 


 Notes
 =====

 For this text, I assume that a char is one byte, a short 2 byte 
 and a longword 4 byte.

 The latest version can be found at my website in the file formats
 section for Galactic Civilizations.
 
 Visual Designs : http://www.tauniverse.com/visual-ta/



 The Header
 ==========

  Variable Name       Size
  ============================
  IDname              Char[6]
  Unknown             Short
  BookNumber          Short


 "IDname" - It's always equal to MTDLIB, I'm guessing it's used to make
  sure it's a valid Pear Library™ file. 

 "Unknown" - It looks like it's always the same thing so far, might
  be some kind of integrity check too.

 "BookNumber" - The number of archived books.


 The header is followed by a series of books.



 The book header
 ===============
 
  Variable Name       Size    
  ============================
  IDname              Char[6] 
  BookLength          Longword
  BookType            Char[5]
  BookName            Char[20]

 "IDname" - Always equal to LIBBLK, so it's probably another
  validity check.

 "BookLength" - This is the length in byte of the book content.
  It starts after the book name (more on this later).

 "BookType" - It's type of the book, there's 2 book type I know
  of so far : PAL_ and SPR1. There might be others but I haven't
  looked at enough files to find out for sure.

 "BookName" - This string is used to give a name to the
  book.


 Right after the book name, you can find the book "content". The
 book content is the size of BookLength. Each book is followed
 by another Book header until you've reached the end of the file.

.................

 Greetings
 =========

  · Saruman & Bobban / DFR Engineering.
  · The old EVA crew and NS

 Hard Rock Save!