Your thread title & post content are inconsistent. You refer to Microsoft Word being required, but then to an error involving Microsoft Excel. What file type are you working with (e.g. does the file name end with the extension docx, xlsx, or something else)?

As for your client's insistence that Microsoft Word be used, that would only be appropriate if the document contains features supported by Microsoft Word but not by any other wordprocessor.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]