How do you read a file in R/3 using XI2

I have this scenario...

File on PC -> XI -> R/3 System

I have installed the XI file adapters on the PC to read my file and send it to XI. Do I need to install another file adapter on my R/3 system if I am going to use a RFC to read the file? The documentation is not at all clear.

I am assuming that the file has to be transfered (via XI and the file adapeters)through to my R/3 system and placed in a directory on that system. My RFC then can read the file as it would any other flat file.

Thanks

Patrick