MODX is the format used for phpBB MOD installation packages. It is meant to be human readable as well as be compatible with automatic MOD installers. | Subscribe to commit list: http://code.phpbb.com/mailman/listinfo/modxtools-commits
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readme.txt

MODX is the format used for phpBB MOD installation packages. It is meant to be human readable as well as be compatible with automatic MOD installers.
Read more http://www.phpbb.com/mods/modx/