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Link error: Undefined Symbol

I am trying to use a .dll to control a USB shutter (Picard Industries). They provide .h, .def., .lib., and .dll files for use with C. I was able to operate the shutter properly using a quick program I wrote in Visual Studio, including the .h header file and the .lib library file. However, when I try to compile in LabWindows, I get the error: Undefined symbol '_piConnectShutter@8' referenced in "Dalsa.c". I have the header and library files (.h and .lib) added to my Project. I have their folders on the list of include paths. I've added other external libraries before with no problems. I cannot figure out for the life of my why the library won't link properly - please help!
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