F3 is the "Find" shortcut for your browser, as I remember. It
really should NOT be used as a keyboard-shortcut in your movie
because of this conflict with the browser.
If delivery can be made by a slower (physical?) container (CD
for instance, or download-then-play), you might try using EXE
output in your Publishing from Captivate. I don't think that F3 is
reserved by Flash Player, so this might work (but of course, I
could also be wrong about the F3 key in Flash Player, too, as I
haven't tested it). Just a thought...