How to route a single IP address out one certain NIC Ethernet adapter?

I am using window xp pro 32bit SP3 on Dell M4300 precision laptop. I program machines with PLC logic before they are plugged into our shop network. I have them all assigned a static IP address for communication on the shop network. They are all in the same subset as the rest of the network. The machine will be like 10.4.25.27 with sub-net 255.255.0.0 . However, I need to be able to use my wireless on the shop floor that is in the same ip range, but every time I plug into a machine I think it tries to send all my information out the wired lan, which makes it impossible to use my network drives, and internet. The wired lan will have an ip address like 10.4.25.50 sub-net 255.255.0.0, and the wireless will be 10.4.25.18 and 255.255.0.0 sub-net. I tried using a command: route add 10.4.25.27 mask 255.255.255.255 10.4.25.50 metric 2, but that fails. Any suggestions?