>I have added the _base.vcx and _datetime.vcx to my application and utilized the _olecalendar. It works fine on my programming computer, but on end-user PC's (W2K & WXP) it stops and issues a dialog box called OPEN and is looking for a file of type ocx. What am I missing?

It's looking for the MS Common Controls OCX. Make sure mscomctl2.ocx is in windows\system32 and is registered.