Sorry again Tom,

from my experience you need not knoe the place of teh very 
application to launch it.

Did youu try launching it by use of thei AppleScript?

tell application "Finder"
	launch application "Name of the Application to be launched"
end tell

Does it work?

If yes, the next step would be to include the AppleScript with your 
FB code but this is the second stept. Try the first one first.

Best
-- 

                   Herbie

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          <http://www.gluender.de>