Using Windows 10 on recently downloaded sysinternals.
Question
Using File Explorer to start help files (*.chm) Eg procmon.chm. Help file loads but page contents blank The Contents, index and search options work but e.g. the Content detail is not displayed on the right hand screen.
Each .chm file has a security option.
Use Explorer to browse to the .chm file, Go to properties at the bottom of the window Security "This file came from another computer and might be blocked to help protect the computer"
Tick the Unblock box, Apply and the help file will now work correctly.
More details here Microsoft: Unblocking sysinternals.zip