Directories Layout:
  |- README.txt          Description of this product
  |- COPYING.txt         License information
  |- INSTALL.txt         How to install document
  |- DIRECTORY.txt       This file
  +- doc                 Additional documents
  +- etc                 Configuration files
  +- sample              Example Excel files
  +- cexcel              A library to read Excel data
  +- cole                A library to read OLE2 file system
  +- excel2xoonips       Main source code of this product
  +- libsl4              A library for basic C algorithm
  +- macros              GNU Autoconf/Automake macros
  +- oniguruma           A library for regular expression
  +- zlib                A library for file compression
