Flash Builder should aleady be building the .SWF file to the output directory.
You can check this by right-clicking on your project and selecting Properties. Go to ActionScript Build Path and check the Output Folder - that is where your compiled .SWF should be.
NOTE: You can also go to Project -> Export Release Build and choose a folder if you want to do a release build.
Thanks for the answer, but if i move the folder to desktop or other place, that swf cant launch..
like a white blank flash.
I need the swf because i want to combine with adobe flash cs 5, i make the " Menu " with flash, and AR with actionscript project in flash builder 4.
im like crazy now to combine them