title: Can Apple Help books handle links using a custom URL protocol?
body: <p>I'm writing a help book for a Mac application to be released in the Apple Mac App store.</p>
  
  <p>When it preview the help book in Safari, links that use a custom URL protocol launch my app and pass it the URL. This is very useful for the help book, since the app lets you create documents using info encoded into a custom URL.</p>
  
  <p>Once I build the help book into my app and read it using the help viewer, however, the links don't work any more.</p>
  
  <p>It looks like the help viewer only supports the HTTP protocol. Has anybody else found a work-around for this? I really don't want to create HTTP links that route to a web server, and get redirected to a custom URL that ends up launching our app. That would be a bad user experience, and would mean using the help book required a live Internet connection.</p>