Chmox is a viewer for Microsoft Help CHM files on Mac OS X 10.3 or later.
DESCRIPTION
Chmox is a viewer for Microsoft Help "CHM" (aka Compiled HTML) files on Mac OS X. It is open source, free, fast and efficient, 100% native Cocoa (uses Safari engine) application.
REQUIREMENTS
Mac OS X 10.3.4 or later.
http://chmox.sourceforge.net/