Step-by-step guide: How to download and install Microsoft's HTML Help Workshop compiler
In order to generate documentation in CHM format, you must first download and install Microsoft’s HTML Help Workshop compiler. This free compiler allows you to use HelpNDoc to generate CHM help files on Windows.
Step 1 - Download the installer
In HelpNDoc, click File then select Options.
This displays the ‘HelpNDoc Options’ window.
Click Download to the right of ‘Microsoft HTML Help Workshop’ path to download the installation software from Microsoft’s web-site.
Alternatively, it can be downloaded from http://go.microsoft.com/fwlink/?LinkId=14188
This will download the htmlhelp.exe software installer.
Step 2 - Install Microsoft HTML Help Workshop
Run the htmlhelp.exe software you’ve downloaded. This displays the license agreement. After you review it, click Yes.
This may display a message, indicating that a newer version of HTML Help is installed. This message is referring to the CHM Viewer that was already on your computer on any recent version of Microsoft Windows; it is not referring to the compiler that you just installed.
Step 3 - Complete the setup
Return to the ‘HelpNDoc Options’ window.
Confirm that the path to the compiler you defined (above) is displayed.
If the path is not accurately displayed, click the button on the far right to navigate to it.
Warning: Make sure the path ends with hhc.exe as any other file will cause the generation process to fail.
The Microsoft HTML Help Workshop software is required in order to generate CHM help files. It is free and easy to download and setup in HelpNDoc.