Presumably you downloaded it because you think you have an mp3 file which has been created using Albumwrap. If so you double click on the album wrap extractor (.exe file), this gives you a dialogue box in which one option is 'extract album', click that and then you get a standard 'select a file box', navigate to your album wrap mp3 and double click that. If it's a valid file it should then expand to show you the individual tracks, you then select the tracks you want, tell it where to put them and away you go. I have to say though that I have come across an awful lot of files that say they are album wrapped when they aren't, in which case you've got an awful lot more work ahead.