PowerPoint won't show presenter view.

[technoknight]

I have created an exe file which simply opens a ppt and runs the slideshow.
The command that I m using inside the exe file is:

ShellExecute(0, "show", Chr(34) & PPTPath & Chr(34), "", "", 0)
Where PPTPath is the path of the Presentation.

It runs fine on single monitor. But, when it comes to dual monitor it gives
me a problem. If I check the option SlideShow-> Set up show-> Show Presenter
View, then also the exe file shows the slideshow on the single monitor
without the Presenter View. If I hit F5 to start the slideshow it will show
the presenter view too. So what can be the problem when I run the show using
my exe? Is there any limitation of the command:
ShellExecute(0, "show", Chr(34) & PPTPath & Chr(34), "", "", 0) that it
cannot show presenter view in dual monitor setup?

Thanks in advance.