通过Excel自动化创建文档时，禁止“保存更改”

In a line of business application I'm working on, we have the ability to export to Excel, which we achieve through Excel automation. We have two methods of exporting - one which saves the files and then goes to attach them to an Outlook email (again through automation); the other is effectively a 'preview' which performs the export to Excel, but makes the application visible at the end, rather than saving/emailing.In a line of business application I'm working o