XI sender and PI 7.1 receiver

I have a strange scenario..where the client would sent data from XI 3.0 which is there in their landscape...

It has to come to PI 7.1 (our system )and be sent to a ftp location...

file-> XI -> PI -> File...

In XI.. I will use sender file adapter and receiver XI adapter to send data to PI system.. is this right??

How shall I proceed from here??

Do i have to just create a rcvr FTP ?? or sender XI and rcvr FTP??

any blogs on similar situation??

Im completely lost...pls help..