Unable to cast COM object of Office Interop Word
Solution 1
Running a repair installation of Office usually resolves that issue.
Solution 2
I switched from using Word Interop to using Late Binding. Quick fix that didn't affect refactoring a lot of code...
Before:
OfficeWord.Application msword = new OfficeWord.Application();
After:
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.
Solution 3
I had the exact same problem and reinstalling Office 2013 solved my issue.
aiyagaze
Updated on July 26, 2022Comments
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aiyagaze almost 2 years
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.