Thanks Erel for your reply. Unfortunaly, I have no access to the target pc, so I can't install anything there.
I've been looking for alternatives. I found SMB library, and I've been testing it. It works grate when the target computer is configured to allow share without users account or passwords. But when I try to conect to a computer with not such configuration, it takes up to 2 minutes to upload or download a small txt file.
Is that correct? Is it the apropiate time to wait?
Thank you again