Not creating Tilde (~) files after a mailmerge

I have a mail merge class that I use to create mailing in my applicaiton.  I am usin office interop.  
The first thing I do is
I copy a Mail Merge file template to a temp directory.  
Then I create the datasourse and with the file in the Temp Dir I do a mail merge
I then copy the temp file using save as to a client folder.  

Every time I make the copy I get a ~$ file in the client folder.  What am I missing.  What do I need to get rid of the ~$  
Who is Participating?
closing the file usually gets rid of it
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