Windows Help files on Windows 8.1

I was using PuTTY and I wanted to read the help file included when you download all PuTTY programs (from here: http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html). I’m running Windows 8.1 and it doesn’t have Windows Help installed. You can get the standalone installer from here: http://www.microsoft.com/en-us/download/confirmation.aspx?id=40899