How to know the installation folder of Illustrator in Winndow

Hi All.

I want to execute a JSX file every time a user click on a MenuItem.

I am able to execute this file when I am writing hardcoded path for it  in my AIP file (right now the file is placed with the Illustrator.exe in Program Files)

But I do not want to use a hardcoded path everytime because it could be different for different-different WINDOWS system.

Now I want to know the installation location of Adobe Illustrator CS6 by using its SDK in VC++..

Do any one of you have any idea about it...

Please help me.

Thanks

Harsh