by H.G.Muller » 24 Jan 2016, 11:11
The checkbox is in the Engine -> Load First/Second Engine menu dialog. The Startup Dialog only shows engines that are already installed through this menu dialog.
I guess at some point MicroSoft stopped supporting the .hlp format. Note that the standard WinBoard install also contains a file winboard.chm, which is a HTML help file. You can directly click that (it is in the same folder as winboard.exe) to launch the help viewer.
WinBoard was supposed to launch it automatically when it could not launch the .hlp viewer. I guess MicroSoft spoiled that by now providing a dummy .hlp viewer that only shows an error message, but makes WinBoard think the launch was successful. I will have a look at it.