If the file has no actionscript have you tried converting it into a movieclip in another file and enlarging it there? If it does have Actionscript, have you tried dynamically loading it into another file and resizing it after loading?
Which version of Flash are you using? What is the actual problem? You say that you can't export, but you don't say what is actually happening. Are you getting an error? Are you not getting a finished file? Or is it something else?
I could kiss you on the lips right now Ned!
I knew that there is a simple work around lying right in front of me!
It takes a bit of polishing but that is definitely less work than it would otherwise.
Thank you thank you thank you!
I'm using CS4.
The problem was that while I can export a video from flash and make it bigger size than the flash document itself, the video is very low quality, like a small picture enlarged in Photoshop, even though it's all vector based..
Ned gave me a great workaround for my problem though, so thank you for your time, unless you have an even better one!