4th Dimension allows you to use a customized icon when building a double-clickable application. Your icon must have the same name as the interpreted structure file. 4th Dimension will use this file when building the double-clickable application. 1. For Windows, place the icon file (.ico extension) next to the interpreted structure file. 2. For Mac OS, place the icon file (.icns type) next to the interpreted structure file. 3. Generate the application file. For additional information, refer to the Building Final Applications chapter in the 2004 Design Reference manual.