How to get Sender File Name in AS2 Receiver Header Message ?

Hi Experts,

I am doing File to AS2 Scenario, and all data transmisson OK.

But at the Receiver side when I open the AS2 Message, I did not see the file name, but I can see default File Name.

Now I am getting as below:

content-disposition: attachment; filename="smime.p7m"

I want the AS2 Header as below:

Content-Disposition: attachment; filename=MyFileName.

Please let me know  how to achive this requirement.

Regards,

Sreeni.