You can include a CHM file in the TOC in your project so that it can be opened in your output.
If you do this when generating Microsoft HTML Help, the linked CHM will be merged with the TOC in the project.
If you do this when generating one of the web-based outputs (HTML5, WebHelp, WebHelp Plus), the user will be able to download the CHM.
Regardless of the type of online output you are generating, you can find the steps for linking to a CHM file in the following topic: Runtime Merging Output From HTML Help Projects (CHM Files).
Note Links to CHM files can be configured in two ways. First, links can point to the CHM file in general. Second, they can point to a specific topic within the CHM. The first method is supported in all of the online outputs mentioned above. The second method is supported only in Microsoft HTML Help output.
