Jennie, I know I've seen an affirmative answer to this before. Sorry, I don't remember the name of the application.
How often do you have to do this? If just this once, it will probably take more time to track down, download, install, run the app, and learn how to use it than it will to change them all manually. If you do it frequently, you'll eventually get a return on the time investment.
Good luck!