Hi deepa

The short answer is:

system("my.exe");
[download]

But the problem with a answer like mine is the old fishing Idiom of 'Give a man (woman) a fish and he'll eat for one day, teach him how to fish and he'll eat for the rest of his life.

Thus the deserved response from Prasad on where to get the answer. The sooner we learn where to get the answers the esier Perl becomes. O'Reilly Programming Perl or Super Search probably the best places to start.