Retrieving a file through services

Hello,
I am currently working on a project that uses the services module to access some content and also to post others. For now, I successfuly manage to retrieve nodes information, users or comments using simple HTTP requests.
Retrieving a file worked perfectly with the version rc3 of services. But since I installed the rc5, I have got the file information like the fid, uid, status or timestamp but the body which actually contained the file is just missing now.
I first checked the authentification, but if I am not logged in, I just do not retrieve any information on the file so I think the problem is elsewhere.
Can anyone help me to actually retrieve a file ? Thank you.