You can, but if you're intending to have buyers download a copy of the SWF file to save on their computer, you may want to zip the file to make sure their browser will actually download a copy of it to keep, rather than just trying to open the file directly in the browser itself.
If you actually do want them to just view your Flash content in their browser, you could use our Redirection feature to send them to the URL where the SWF is hosted on your site:
http://www.e-junkie.com/ej/help.redirection.htm
