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Using COM API of fusion usb adapter

http://www.ti.com/tool/fusion_usb_adapter_api

Hi, everyone:
                             Does anyone use API of COM which named "TIDP.SAA2.tlb" in the above link?? Why I import this to my project and my compiler didn't know definition of "_VersionPtr" in the "tidp.saa2.tlh" file. I confirmed I have already put "TIDP.SAA2.dll" in the same project. Can someone tell me what's wrong or is this a bug!?? Thanks in advance