Unable to cast COM object of Office Interop Word


My application has a feature to export to Microsoft Word, but it hasn't worked since I've upgraded from Microsoft Office 2010 to Microsoft Office 2013.

Here is the code:

Microsoft.Office.Interop.Word.Application appVersion = new Microsoft.Office.Interop.Word.Application();
appVersion.Visible = false;

and this is the error message:

Unable to cast COM object of type 'Microsoft.Office.Interop.Word.ApplicationClass' to interface type 'Microsoft.Office.Interop.Word._Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00020970-0000-0000-C000-000000000046}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

Someone told me to edit the registry, but the IID "{00020970-0000-0000-C000-000000000046}" does not exist in my registry.

asked on Stack Overflow Mar 12, 2014 by aiyagaze • edited Jan 21, 2015 by Air

4 Answers


Running a repair installation of Office usually resolves that issue.

answered on Stack Overflow Mar 20, 2014 by cremor

I had the exact same problem and reinstalling Office 2013 solved my issue.

answered on Stack Overflow Aug 15, 2015 by Alex Jolig

I switched from using Word Interop to using Late Binding. Quick fix that didn't affect refactoring a lot of code...


OfficeWord.Application msword = new OfficeWord.Application();


Type wordType = Type.GetTypeFromProgID("Word.Application");
dynamic msword = Activator.CreateInstance(wordType);

Solved my issues on a bunch of corporate computers that started seeing this problem after an Office upgrade by Client Support.

answered on Stack Overflow Jun 22, 2020 by Popeye • edited Jun 22, 2020 by Matt Ke

Old question, however I ran into the same thing, same exact error message when trying to create a new word application. The problem was simple, once I closed VS in frustration and went to do other work. When I opened word, it had retrieved documents that had not been saved when Word closed down and wanted to know what I wanted to do with them. I told it to delete them, closed word and my code worked fine. Still working on a way around this but I thought I would drop this in here to save someone else from reinstalling office when it was something simple.

answered on Stack Overflow Sep 3, 2020 by Kassabba

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