Making a preloader - can I stream a swf movie?

Hi there,

Potentially stupid question. I have a large piece of software (a game) that I would like to preload by playing a movie. The movie can be designed in Flash Pro, and thus can be a swf. The perk of this is that the file size can be pretty small compared to most movies (and it'll scale). However, I would very much like this movie to stream so it can start playing right away. Is this possible? Or to do so would require to convert it to an FLV or F4V file?

Thanks.