The LinkSys does not support AppleTalk on the Wireless part of the LAN. To file share wirelessly, you are going to have to file share using TCP/IP. Assuming all computers are OS 9, then open the File Sharing Control panel and check the box for "enable file sharing over TCP/IP". Then when you go into Chooser and click on the AppleShare icon, click on the IP Address button in the right pane and type in the IP address of the computer you are trying to connect to.