Merci,
J'utilise effectivement Shellexecute(), voici le code qui me convient (avec l'aide d'un autre forum)'Option Explicit
Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
Dim Rep As Long
Dim Prog As String
Prog = Environ("ALLUSERSPROFILE") + "\MonFichier.htm"
Rep = ShellExecute(Me.hwnd, "open", Prog, "", Prog, 1)