How to open a file use default AP like double click in Windows Explorer ?

Good afternoon , everyone :
Do you know how to open a selected file with default AP when you double click on it ?
Just like Windows Explorer does.Double clicking on .Jpeg file maybe opened with iphoto express or photoshop dependents on system setting ?

Thank you advanced.

Best Regards.
Gloria

use the ShellExecute(Ex) API and specify the "open" verb.

Thank you very much.
It works fine.

Gloria

Hello,
May I ask you one more question ?
Is there any prework when I use
ShellExecute with verb "properties".
When I use it,the error message is
ERR_NO_ASSOC.

Thank you in advanced.

Best Regards.
Gloria