It is highly suggested to remove the ?dest-id... from the URLs, there are a handful of services that use the value at the end of the URL (.mp3) to determine the file type. It works with iTunes and most players but it is not worth the hassle. Plus the dest-id is a setting that is specific from the feed you got the media URL from, keeping that will not be helpful. I would just get into the habit of not including it.
If you have a lot of urls with the value you can use the Find and Replace media URLs option in PowerPress > Tools menu.