Quindi la soluzione:
codice:
Function WordConv(wrd As Word.Application, fileInput As String, fileOutput As String, tipo_oggetto As Long)
Dim wrd_doc As Word.Document
Set wrd_doc = wrd.Documents.Open(fileInput)
wrd_doc.SaveAs fileOutput, tipo_oggetto
wrd_doc.Close
End Function
Function ApriWordApp() As Word.Application
Dim wrd As Word.Application
Set wrd = CreateObject("word.application")
Set ApriWordApp = wrd
End Function
Function ChiudiWordApp(wrd As Word.Application)
wrd.Quit
Set wrd = Nothing
End Function
...Elaborazione terminata in 2 minuti, grazie mille ancora.