STRPTR name = GetIconFormat(APTR handle);
HWEXT_ICON_FORMATextension bit has been set. See Extension plugins for details. If that is the case, this function must return a null-terminated string containing name of the format of the icon file handle passed in
handle. The string returned by this function can be retrieved from Hollywood scripts by querying the
#ATTRFORMATattribute on the
#ICONobject type. The string you return must be valid until FreeIcon() is called on the image handle passed to this function.