Hi Praveen,
Well there are 2 ways.
1. Download the File to your presentation server and send it in fore ground 
2. Send via FTP Command from your application server.
Here is how to achieve it.
Run program: RSFTP005.
The RFC destinations SAPFTP and SAPFTPA will be created automatically.
a) SAPFTP (for local system)
b) SAPFTPA (for running in Application server)(This is used for file transfer in background.
2) Code sample for developing FTP programs can be got from report program
a) RSFTP002
b) RSFTP007
c) RSFTP008
Regards