Thanks very much for the reply - I read it as file2pc was a program to copy files from the 8-bit to a PC directory, but I agree it is a bit ambiguous. If you have RespeQt (version 4(?) or similar), is there any chance you could test out file2pc.obj (it is on the ATARI.ATR image) with your Pi as a PC-Link server? File2pc.obj is sending (SIO) status requests to device $3A, which is supposed to be reserved for PC-Link. I think this can be done, but I haven't installed RespeQt on my Pi, and don't want to start hacking the file2pc.obj sources until I am sure I have an environment that I know it works in.
My Pi is stripped back. It's running headless on 2GB SD card. no Qtlibs, so no AspeQt/RespeQt. I don't remember if Atariserver can be built for Pi