You can do a SaveAs and save the file as .doc instead of .docx

>An office automation program that has been running for eons is now creating files that can't be read by the recipients.
>It turns out that if the W/S that creates the file is running Office 2010, the file has to have a different extension.
>Of course, at this client, there are scads of different versions of Office on different W/S.
>How can I determine, using Office Automation, what verion of Office is running.?
>Thanks