how to add the S-file into N-port in Ansoft Designer?

I am a beginner for it and i wanna download s-file from Aligent homepage.
But my prob. is i copy the s parameter onto a notepad and then save it as .s2p file. The Designer cannot identify this file! Why??
What should i do to import the s parameter file??

Did you copy a file header?
S file consists of one line of text describing frequency range, number of ports and so on and bellow are the Parameter data.


:D

Thx a lot.
I got u...