importing .wmv files from adobe photoshop elements

My mother-in-law created a slideshow with adobe photoshop elements 6.0 and I can get into into a .wmv file but can not import it to imovie. I saw another post about changing the code on the PC but can't seem to find a place to do that on the program. This is a one time thing and I don't want to pay for a conversion software that I will never use. Any ideas? I thought about just burning a DVD of the slideshow and then trying to import it that way, will that work?