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You can run the AIR app separately, it should still be on your system (Applications > Adobe > Adobe Help or the root of your Start menu on windows).
If for some reason the app isn't there, reinstall it from http://www.adobe.com/support/chc/. There's a preference under Edit > Preferences > General Settings for "Accessibility Mode". If you select "Open Help in browser", your Adobe applications will open a browser instead of launching CHC.
Jason San Jose
Software Engineer, Flash Builder
I'm using Fb4 on Mac. I also have CS5 installed. When my caret is on class name and hit 'Shift-F2', Fb4 opens up Adobe Community Help (ACH) correctly with the class API shown. But, when my caret is on a method of a framework class, it doesn't show the method API anymore. It instead takes me to the Fb help home page. This used to work before for me. I've tried reinstalling ACH and it didn't help.