Hi Ravi,
You can try using Protocol Advisor to check if there will be some suggestions.
The choice of the protocol however will depend on the the technologies it was developed with and the communication protocol the application is using.
Please also review the following posts:
If you upgrade to LoadRunner 11.52 or 12.01 you will be able to try using Proxy recording. Please check the following post:
Kind regards,
Vesela