Store URL issue in Windows IIS

I have wordpress installed in Windows – IIS server and my permalinks works only if it has index.php else it wont work. The site is working fine but the URL for store pages like Cart, Shipping and Checkout doesn’t include index.php in the URL.

How can I make the URL to have index.php like http://atoztracker.com/index.php/store/shopping-cart/ instead of http://atoztracker.com/store/shopping-cart/ ?

http://atoztracker.com/store/shopping-cart/ URL throws Page not found error.

Kindly help