overdub
I found the CHM file but my Windows 10 doesn't know how to open it. How does one open that file?
Have a look at this article:
https://support.microsoft.com/en-ae/help/917607/error-opening-help-in-windows-based-programs-feature-not-included-or-h Also right click on the .chm file and select properties, then select unblock (Read this another:
https://community.spiceworks.com/topic/1961503-solved-windows-10-chm-help-files-showing-up-blank )