Do you ever get files sent to you in, say, an old Word Perfect or Microsoft Works format that Office can't open? Check out Zamzar! It's a free online service that will convert all sorts of odd file types to more user-friendly formats. Here's a list of the file types it can handle. You can either upload the files to Zamzar (100MB file size limit) or give it a URL to the file. If the ads bug you, they do offer an upgraded service (for a fee) that will get rid of them.