The fourth tutorial has been released in the engine design tutorials. The fourth tutorial explains how to work with archives and create a window via the engine. The engine can now also read from zip archives (through zlib), and implements the nvArchive interface for the ability to add new archive readers like rar, pak, etc. A new "Documentation" section has been added, which contains the first edition of the Nirvana3D engine API reference in chm format. See http://nirvana3d.sf.net/.