The Microsoft HTML Help compiler is available free of charge. You need it to turn HTML pages into a compiled help (.chm) format. The package includes a help file with detailed documentation of the entire HTML Help system.
Installer for MS HTML Help Workshop ("htmlhelp.exe").
After installing HTML Help Workshop you will see a message that you "already have a newer version of HTML Help". Please ignore it! This message refers to the run-time components for displaying HTML Help on Windows, and on current computers the existing runtimes are always newer than those in the HTML Help Workshop package.
A help authoring tool like the market leader Help+Manual makes editing and creating CHM help files 10 times faster.
It is an invaluable time saver, lets you work in a comfortable environment similar to that of a word processor. In addition CHM files you can also generate HTML5 website-based documentation, PDF manuals, Word documents, universal eBooks and several other formats.