Sub Travail_vin()
Dim Dossier As String, Fichier As String, Chemin As String
Dossier = "C:\Users\djodj\Dropbox\Recettes\Compléments\"
Fichier = "Les vins.xlsm"
Chemin = Dossier & Fichier
Dim Presence As Boolean
Presence = False
For Each w In Workbooks
If w.Name = Fichier Then Presence = True
Next w
If Presence = True Then
Workbooks(Fichier).Activate
Else
Workbooks.Open Filename:=Chemin
End If
End Sub