kchmviewer v6.0 had been ported to OS/2 and eComStation. (2012/03/08)
"Kchmviewer is a free, open-source chm (MS HTML help file format) viewer written in C++ for Unix, Mac and Windows systems by George Yunaev. "
Link: ftp://ftp.netlabs.org/pub/qtapps/kchmviewer-6.0-os2.zip
This port requires the Qt 4 libraries and libc064.dll .
Office Web Page: http://www.ulduzsoft.com/kchmviewer/
Port by Elbert Pol