Ok, so I thought media-convert.com could do it. Tough luck (for now). Perhaps sometime soon. So I fired up the trusty search engine. You should know by now.
After unsuccessfully trying out at least 3 online file converters, I realized I needed something better than a service that requires a fee for a year's worth of file conversion service. Then I discovered Zamzar.com. Price per month FREE, Maximum file size: 100 MB. You'd need to shell out money for anything beyond that though. Guess that doesn't apply to me.