Album Wrap files contain MP3
files inside which File Juicer can extract.
If the MP3 files contain ID3 tags File Juicer will usen them to give the extracted files more reasonable names, otherwise they inherit the name of the album wrap file with a number added to the end.
Since File Juicer can extract many file formats found in other files you may only wish to search for mp3 files inside the albw file. Just need to check the MP3 checkbox in File Juicers preferences, and only mp3 files will be extracted. Alternatively you can check just the jpg and png ckheck boxed and only the album art will be extracted.