The Iconfactory on Thursday released IconBuilder 5.1, a free update to its icon creation plug-in that adds support for Macromedia Fireworks MX 2004. The software was previously only compatible with Adobe Photoshop 7.0 or higher. IconBuilder can create icons for either the Windows or Macintosh operating system and can convert icons between the two. The full software is US$69 or $349 for a site license. IconBuilder 3.x or 4.x users who bought the software after Oct. 1, 2003 can upgrade to the latest version for free; anyone who bought it before that date can upgrade for $20.