How to make MS Word auto run my marco?

How to make MS Word auto run my marco when open the document?
But not all documents, only the document I want.

My marco is attached.
Sub MailMerge()
'
' MailMerge Macro
' Macro recorded 2010/4/13 by Billy Ma
'
    ActivePrinter = "Oce (Engine)"
    With ActiveDocument.MailMerge
        .Destination = wdSendToPrinter
        .SuppressBlankLines = True
        With .DataSource
            .FirstRecord = wdDefaultFirstRecord
            .LastRecord = wdDefaultLastRecord
        End With
        .Execute Pause:=False
    End With
End Sub

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mawinghoAsked:
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GrahamSkanRetiredCommented:
Modify the code a bit and put it in the ThisDocument module of the document
Private Sub Document_Open()
'
' MailMerge Macro
' Macro recorded 2010/4/13 by Billy Ma
'
    ActivePrinter = "Oce (Engine)"
    With ThisDocument.MailMerge
        .Destination = wdSendToPrinter
        .SuppressBlankLines = True
        With .DataSource
            .FirstRecord = wdDefaultFirstRecord
            .LastRecord = wdDefaultLastRecord
        End With
        .Execute Pause:=False
    End With

End Sub

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mawinghoAuthor Commented:
In fact, I find out a solution by using the command below
 
"c:\Program Files\Microsoft Office\OFFICE11\WINWORD.EXE" /mMailMerge /q C:\Quotation.doc

Your solution is helpful anyway!! Thanks!
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