As you know, the .chm file format is a potential security threat. As such, the ability to view the file is often restricted by network security settings.
ABC Amber CHM Viewer is a free powerful tool that allows you to view CHM files (Compiled Windows HTML Help files) under Windows. The program does not use MS Internet Explorer to view CHM topics, so it's much safer.

Partial Features List:
- reads CHM files and displays CHM topics;
- shows pictures, maintains hyperlinks;
- keeps the structure of CHM file;
- easy to use and easy to set up;
- multiple language support;
- and more...