So what kind of server then? FTP, HTTP, SSH (to allow SCP), Rsync...
I would guess that since it's simply for file swapping, FTP or one of the P2P protocols would fit your need. You likely have ProFTPD on one your install CD's in the RPM format, simply plop in the disc, and try to locate it via the Mandrake Control Center Software installer. From there it will likely work out of the box, however, if you want to tweak it there are many sites that specialize in that area, you can read the man page, or search LQ.