KW 3.2 - is a little hack to see the the number of the week in Dates. If you tap the week number, there will be a floater in which you can choose a week to be shown in the calendar. KW.PKG is an Auto-Part which means you can't see an icon of it in the 

extras drawer but you'll see it in Dates at the upper left  position. If you have a Newton with OS 2.0 or greater, you will find KW in Extras/Extensions