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
Private Sub CommandButton1_Click()
Dim sFile As String
sFile = "C:\Program Files\Norton AntiVirus\enulotus.hlp"
Call ShellExecute(0&, "Open", sFile, vbNullString, vbNullString, 0&)
End Sub