You should override this method if you do not want the shell to change the icon on your class of data file objects or if you want to set your own icon for your set of associations that fall outside of the range that the shell knows about. If you do override to set the icon, you should use _wpSetIcon.
Additional methods overriden in class: WPDataFile
These methods have been overriden to call wpSetAssociatedFileIcon on the data file if the object is initialized (except for wpRestoreState) and the icon on the data file is a default icon (OBJSTYLE_NOTDEFAULTICON is off).
Additional methods overriden in class: WPProgramFile
wpSetAssociatedFileIcon is overridden so that the program file icon that corresponds to the program and not to the associated view can be set.