Default: none
Valid Values: GIF, JPG, ICO (case insensitive)
Example:
UI_ICON_EXTENSION=GIF
This environment variable specifies the type of image to use in your Forms applications and to display it at design time. When you set this variable as "gif" (case insensitive), the extension that will be added to "Icon Filename" is ".gif". Specify the location for these images with the UI_ICON environment variable.
When this environment variable is not set, or is set incorrectly, .ico is the default extension.