How do you change a ppt file to a vector-based format image?

You may not be able to. There may be an option in Powerpoint to export or save as an eps, but if you have used any rasterized art you can't get a vector based file.
You may not be able to. There may be an option in Powerpoint to export or save as an eps, but if you have used any rasterized art you can't get a vector based file.