Originally Posted by rdoyle720
Well I don't know of any easy way to do it. If you just embed the movie at the right size it will resize, but 800 x 500 isn't proportional to 1000 x 700 (714 x 500 is proportional). If most of your content is vector, everything should still look pretty good.
If embedding the file at a smaller size isn't acceptable, the best you can do is change the .fla manually. You can use Edit Multiple Frames (it's a button at the bottom of the timeline) to help, but it's still going to be a tedious process.