There is no way to do it inside of FlexBuilder, but luckily its still pretty easy to do it in the Flash Player. Just open up the flash application (if you have FlexBuilder installed it will be under Applications/Adobe Flex Builder 3/Player/, under Windows the path is the same except you substitute C:/Program Files in the place of Applications. Once you open that, go to the file menu and click open to browse to your swf.
Open it, and if you don’t get some ridiculous security sandbox error, you should be able to go to the file menu again and click create projector.
Pretty neat little trick if you can’t stand doing much of anything in the Flash IDE but still need a projector file. Other applications like MDM’s Zinc will do roughly the same as well, if you’re willing to fork out the cash.
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