High Quality Content by WIKIPEDIA articles! IconBuilder is a popularplugin for Adobe Photoshop, Adobe Photoshop Elements and Macromedia Fireworks for the editing and creation of computer icons created and used by The Iconfactory. It supports all icon sizes for both Mac OS X and Microsoft Windows. IconBuilder was created when there was no official tool from Apple Computer for making icons in the .icns format introduced by Mac OS 8.5.