You should provide an index file in your Help Book folder before building a Mac OS Application. I use Apple's 2015 Help Indexer application. After I run it it creates a file called HelpBookFolderName.helpindex. This appears to do nothing. When I use the application's Help->search menu field to look for keywords in the Help Book they aren't found. Also the title page has a find field that can't find anything. Does anyone have similar problems or solutions to this problem?