>but I need to aske you question what is this?
>is it a PRG File or a Class or what
>
>I need to open a Calendar By ComboBox.

This is a PRG file that creates a olecontrol class (activeX).. Every control can be used visualy (as Sergey said) or by program.. On visualy mode you can drag&drop the controls directly to your form. So, it will be more comprehensible by you.. The error message that you got, was due to your Windows didn't recognize this control. Every control must be installed in your system..

Please, goto TOOLS/OPTIONS menu and CONTROLS.. There you will see many controls that VFP can install for you.. Usually the control that you choose will be usefull by your applications.. In certain cases only using REGSVR32 windows's program to install onto your system..


By the way, Here at ut your thread (doubts) is usually the same one of many people.. Please, try to do not mix diferent subjects.. So, on this way you will also help a lot of people.. The central idea of one thread is to have beginning, half and end..

The best way to be thankful for one person that help you is marking his thread as the correct answer for your thread.. and/or mark his thread as the help of your thread

HTH

Claudio