I got the same error with the following link but I couldn't solve my problem: A reference to the dll could not be added
A reference to the "....dll" could not be added.Please make sure that the file is accessible and that it is a valid assembly or COM component.
As suggested, I located TblImp.exe in two directories: "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin" and "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin\x64"
I used on both command prompt and VS2015 to use CMOS_USB.dll with TblImp.exe but couldn't solve my problem.
When I used command prompt I got;
C:\Users\tufankesen>TlbImp.exe CMOS_USB.dll 'TlbImp.exe' is not recognized as an internal or external command, operable program or batch file.
When I tried this in VS2015 Command window. I got;
"Command "TlbImp.exe" is not valid."
System Specs: 64-bit, VS2015 Extra: My source codes are in D:\Sources... folder
Thanks for any hints/replies