Use the Format item to specify the default format for the icon to be saved in. After you select a format, that format will be used when you choose Save on the File menu. That format also becomes the default item of the Save menu on the File pop-up window. See "Loading and Saving a File" for more information.
If your icon is black-and-white, it can be saved as a regular Xview icon, as an X bitmap, or as a Monochrome X pixmap image. Save the icon as an Xview icon if you want to display your icon in the File Manager by binding it to an application or data file using the Binder. See Chapter 16, Binder for more information. Save the icon as an X bitmap if you want to include it in a C program. A monochrome X pixmap image might be used for some XView applications.