I was creating a photo slideshow with Windows Photo Story. It was swell until I tried to import an MP3. It either said the file wasn’t valid, or imported it then crashed on preview. If you run into this problem and spend over an hour trying to figure out what’s wrong with the MP3 (like I did), here’s a quick workaround.
Convert the MP3 to a WMA and import that instead. I used the free NCH switch to do the conversion. The WMA imported without a hitch.