My code is now like this:

MyWord = CreateObject("Word.Application")
MyWord.Visible = True
Dim NewDoc As Word.Document
NewDoc = MyWord.Documents.Add(file)

But I get an error Bad Image Format Exception was unhandled.
Could not load file or assemply Interop Word Version 8.2.0.0.

I have:
Public MyWord

and reference MSWord 10.0 Object Library v 8.2.0.0