Office document customization is not available

Asked By 10 points N/A Posted on -


Hi experts,

When I tried to run excel VSTO project within Visual studio, the excel file opened with an error message. I closed the excel file and restarted it within VS again but the same error displayed. I am using the latest version of VS. Any suggestion would be helpful to demolish this error.





The customization assembly could not be found or could not be loaded. You can still edit and save the document. Contact your administrator or the author of this document for further assistance.

Answered By 0 points N/A #182522

Office document customization is not available


Hi Mark,

The error message on you received is a common issue with Microsoft Word 2003 and Excel 2003 VSTO customizations with embedded customized documents. You can bypass this issue if you use VSTO related document properties by adding customization to outer documents. You can use the following:

1) _AssemblyName – indicates that the document from MS Office has a VSTO customization.

2)_AssemblyLocation – has a string that gives details or information about the manifest for the customization.



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