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Update: Our friends at Autodesk have released an official CHM for both MXS and SDK!
Get it here: http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=16707768
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This will convert the downloaded offline max2013 SDK help files into a CHM for your convenience. You can make a CHM for both the dotnet_ref and the cpp_ref parts of the help. For a MaxScript CHM check out http://www.scriptspot.com/3ds-max/scripts/maxscript-2013-help-chm-creator.