CHM stands for Compiled Help Modules and is a Microsoft Compiled HTML format. The CHM format is used in Microsoft HTML Help, the standard help system for the Windows platform. A CHM file is basically a collection of HTML documents and other data such as images and JavaScript compressed into a single file.

How do I open CHM files?

You can open CHM files via Mozilla Firefox by using the CHM Reader addon which helps you open CHM files within Firefox itself.

Download the CHM Reader addon for Firefox.