Hello Don't put CHM into protected folders - C:\, C:\Program files e.t.c. Put it somewhere where "user" have rights to write
Downloaded HELP file is in protected mode - it doesn't show HTMl content for safety. How to "unprotect" it, read this: https://answers.microsoft.com/en-us/windows/forum/windows_8-files/chm-file-show- empty-page-in-win-8-pro/be50ccef-f4c0-4145-8f72-5d42d9e78ded -- <https://forum.pspad.com/read.php?2,71912,71913> PSPad freeware editor https://www.pspad.com
