Par file deployed without code

Hi Experts,

Our portal version is SAP EP 7.02 SP23.

We have a custom par file developed. Now we want to do changes to it.

When I try to download the custom par file. It contains only custom jar file (in that jar file there is only one class file.).  how  can I customize this par file.

I believe the developer who developed this applicaiton has not deployed the par file with the code. Generally from deploying through NWDS, we need to check the deploy par file with code check box.

Now we don't that code available in NWDS. We have only the par file which is deployed in the portal server.

Can you please throw some lights like is there any possiblity to customize this particular par file. If it is possible please let me know , how to achieve this.

Thank you,

Raghu