I was sent a CHM file from one of our software vendors, and I was unable to view the contents. Although the file enclosed in the zip opened up, but individual pages will not display.
After requesting a revised version from the vendor I came to know that it’s more of a security issue on windows rather than anything to do with the chm file itself.
Please check out URL below if you are having problem viewing contents of a chm file on windows.
In short view the properties of the chm file, and click on the unblock button to unblock the chm file, which blocks the chm file from opening properly.