How did you find a demo version of CS3?
i saw it on youtube
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If you have an flv file, that is a video file, which I believe is not a file you would normally open and edit with Flash. Though I may be wrong since I have minimal experience with flv files. My only experience is loading them into Flash files to play them.
If it is an fla file.... If you started with a Flash 8 file and saved it as a CS3 file, then you need to have CS3 in order to be able to save it back as a Flash 8 file. While you could open the file with any of the newer versions (CS4, CS5), each version can onmly save backwards one version.
oops i meant .fla