I can't be the first to ask this question... Giga-tronics 8888A - USB ?

Hi- I've searched the board and don't see a reference to this.  At least I've tried not to duplicate a previous question...
I am updating a measurement app that is developed with CVI 8.1.
All previous instrument comms have used GPIB.  
App works beautifully, but needs an upgrade on an instrument.
The owner of the app now wants to add a USB comms device, a Giga-tronics  8888-A.
http://www.gigatronics.com/product/c/GT-8888A-USB-Power-Sensor
The device comes with the necessary .dll, .lib and .h.
However, if I attempt a static link the linker cannot find the function calls.
Next I attempted a dynamic link and successful loaded the .lib, but again the function could not be found.
In that case LoadExternalModule (pathname) was successful, but GetExternalModuleAddr (module_id, funname, &status)
returned an error.  (yes, I checked spelling).
Has anyone had these problems before?  
What are the typical problems I should look for with 3rd part libs?  
Any typical "Fixes" to recommend?
Thank you.

@ ebalci - thank you for the help.  This has started me down the correct path- 
One new question is that the "generate dll import library" now barks at this line:
GTPM_API STATUS __stdcall GTPM_GetExtendedAveraging(unsigned long instrumentHandle, BOOLEAN *pEnabled, long *pExtAveraging);
with the error "missing parameter type".
It does not understand the BOOLEAN type.  I understand the c does not have this type, so how do we ensure that the "generate dll import library" knows this type? 
Since this is a third party .h, .lib and .DLL then maybe I am left to contacting giga-tronics and getting support from them.    Thanks again for the help.

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