Function DernierFichier()
Application.Volatile
Dim chemin$, a(1 To 2, 1 To 1), fso As Object, dossier As Object, f As Object
chemin = ThisWorkbook.Path & "\Fichiers" 'à adapter
a(1, 1) = ""
Set fso = CreateObject("Scripting.FileSystemObject")
For Each f In fso.getfolder(chemin).Files
If f.DateCreated > a(2, 1) Then
a(1, 1) = f.Name
a(2, 1) = f.DateCreated
End If
Next
DernierFichier = a 'vecteur colonne
End Function