I have a set of AI files that I want to scale up. The AI files have a size of 200x200, and I want to scale them up to 400x400. As Illustrator does things with vectors it's not a problem, but now I want to do this for many AI files, and wanted to do it programmatically. Imagemagick's convert is able to take an "ai" file as input, but does not appear to be for vectors - when scaling down it works fine, but when scaling up, it gets a little blurry.
What is a good way to batch on these?