I'm not very clued up about setting up wpad.dat at all but we've just upgraded our proxy server from win2k to win2k3. Now we're still on ISA 2000 but it looks like we're on new IIS(6).
Before the upgrade, users used to connect to wpad.dat via automatic configuration script which looked like this. http://server/wpad.dat
but now it is http://server:8080/wpad.dat
We need to bypass proxy for a few web sites but we cannot find wpad.dat anywhere on the new server. If we type http://server:8080/wpad.dat
the file comes up and we can save and view it. But we're not too sure where it's coming from. We just need to modify this file so we can specify a few websites for bypassing proxy. I bet you wpad.dat will probably look different as this is IIS6?