You can't use /play with sockets. And I need to send the contents of the text file via sockets.

OK, I tried using /bread, it seems to be doing exactly what I want, but could someone tell me if I did it correctly?

Code:
    if (($isfile(rserv.txt)) && ($file(rserv.txt).size > 0)) {
      bread rserv.txt 0 [color:red]$file(rserv.txt).size[/color] &rserv
      sockwrite user &rserv
}