To Whom it May Concern, cf: "python361.chm file doesn't render properly" Apparently, at least on that MS version number, i.e., Win10, one has to 'Unblock' the .chm file. Sincerely, Eric Lindblad http://nurmi-labs.blogspot.com/2017/06/vim-notebook.html https://docs.python.org/3/download.html python361.chm Download the above "Windows help file", right click on the .chm file, and from the appearing context menu click "Properties", then enter a mark ☑ in the box next to the word Unblock and click the "Apply" button, close the "python361 Properties" window, and relocate the file.