So I'm using Visual C++ 6.0, and trying to compile some source code, but upon compilation I get this:

Linking...
LINK : fatal error LNK1104: cannot open file "Iphlpapi.lib"
Error executing link.exe.

I'm using the correct SDK, and the directories are correct. I've checked, double checked, and triple checked. The file is the specified directory. I can't figure out what the problem is. Any ideas?

Service Pack 6

SDK for Windows Server 2003 SP1 //Sounds odd, since I'm running XP SP3, but this has worked for me in the past.

Like I've said, it worked in the past for me, flawlessly. I don't understand why it won't work now.