Receiving "Error loading type library/DLL" When Using ActiveX Automation with Microsoft Excel and LabWindows™/CVI™

Updated Dec 22, 2017

Reported In


  • LabWindows/CVI Full

Issue Details

I created an application in LabWindows™/CVI™ that communicates with Microsoft Excel via ActiveX Automation. However every time I launch a new Excel application, I receive error -2147312566 with the message "Error loading type library/DLL". The installation of Microsoft Excel was normal and its seems to be working correctly. Why am I getting this error and how can I resolve it?


This ActiveX error is typically associated with registration of the software (i.e. Windows registry). Unregister and then register excel.exe located at 

C:\Program Files\Microsoft Office\OfficeXX 

Refer to the links section below for how to register ActiveX components.


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