Always a fan of off line help...
Pretty pages thusly:
click the FMP_help and you *might* expect to get back to a pretty home page.
this is your view now...
10 minutes work for someone please...
and while you are there could there be some version and release date information visible too please...
Curious how you got the help in the state as shown in your first screenshot. Have not been able to get just "FMP_Help" to show up on the left side of the screen.
As far as opening the FMP_Help.html file directly, versus say the Open Help.html or even the Resources/index.html file, that wasn't how it was designed to work. With that said, it probably should work like the rest of the files do.
Double clicked the Open Help file from desktop
Wandered through help.
Clicked link in favourites to offline FMP14 help
Clicked link in favourites to new offline help & you can never get the whole lovely experience back