Hello,
With the help of RB Smissaert, I wrote a VBA proc which set a ref on Word
before the main macro, then another which remove this ref.
I tried to adapt this macro in a MS Project module:

Sub BuildWordReference()
Dim Ref As String
Ref = "{00020905-0000-0000-C000-000000000046}"
ActiveProject.VBProject.References.AddFromGuid Ref, 0, 0
End Sub

The macro above worked 5 times, but doesn't work anymore ... ;-(
Sometimes, I get the error message : "runtime error '32813' Module name,
project or object library already used"
The second macro, which is supposed to remove the ref, *never* worked ;-(((
(No error message)

Sub RemoveWordReference()
RemoveReference "Word" 'Call
End Sub

Sub RemoveReference(strReference As String)
On Error GoTo ERROROUT
Dim R As Object
For Each R In ActiveProject.VBProject.References
If R.Name = strReference Then
ActiveProject.VBProject.References.Remove R
Exit Sub
End If
Next
ERROROUT:
On Error GoTo 0
End Sub

Could you help me? Thanks ahead!