Option Explicit
Sub Save_Wbk()
Dim Fichier$, Chemin$
Dim AncienNom$, NouveauNom$
AncienNom = "C:\Users\" & Environ("Username") & "\Toto.xlsm"
NouveauNom = "C:\Users\" & Environ("Username") & "\Classeur1.xlsm"
Chemin = ThisWorkbook.Path & "\"
Fichier = "Toto.xlsm"
If Dir(AncienNom) <> "" Then Name AncienNom As NouveauNom
Application.DisplayAlerts = False
ActiveWorkbook.SaveAs Filename:=Chemin & Fichier, _
FileFormat:=52, CreateBackup:=False
Activeworkbook.save
Application.Quit
End Sub