CHM is a special extension of IE.
The patch to make any windows compatible with CHM (except Win 3.1) is downloadable at http://www.microsoft.com/downloads/release.asp?ReleaseID=30328
To handle and generate CHM I found a french page (tools are in english). http://www.jurixt.com/informatique/hlp_compile_aide.htm
Utility to decompile CHM and many many more : http://www.keyworks.net/keytools.htm
Google power !
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