I've seen examples of Add-in code which can create a new mail message and
add an attachment to it.

Is there a way to add an attachment to an email the user is currently
composing?

From the email editor (i.e. Word running from Outlook), I want to provide a
button which shows a dialog. When the user picks an item from the dialog I
want to create a local file and add that file as an attachment to the email
message the user is currently editing.

I'm familiar with writing Add-ins for Word and Outlook. I've been through
the forums and MSDN but cannot figure out how to do this.

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David Wendt