libchm1 2:0.39-2 (powerpc binary) in ubuntu gutsy

 It is a very simple library, but sufficient for dealing with all of the
 chm files. Library currently does not has write support.
 .
 CHM files are used on the Micosoft Windows platform to store program
 documentation, almost always in the form of HTML, with some non-standard
 quirks. CHM files are a form of archive known as InfoTech Storage Format
 (ITSF) files and contain some special files to implement features of the
 CHM viewer. On Windows they are accessed through a kind of virtual
 filesystem exposed by a dynamically loaded library. ITSF files have
 UTF-8 filenames and use an LZX cruncher to compress all the files in one
 big chunk. Both the ITSF and the formats of the internal CHM files are
 highly indexed and their designs are all clearly optimized for read-only
 access.