Sub test()
Dim Wbk As Workbook, Chemin$, Fichier$
'Set Wbk = Workbooks.Open("https://monsharepoint/mondossier/monsousdossier/monfichierquivabien.xlsx")
Chemin = "https://monsharepoint/mondossier/monsousdossier/" '==> A adapter bien sur
Fichier = Range("A1") '==> A adapter bien sur
Set Wbk = Workbooks.Open(Chemin & Fichier)
End Sub