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 Const SW_HIDE = 0
Private Const SW_MAXIMIZE = 3
Private Const SW_MINIMIZE = 6
Private Const SW_NORMAL = 1
Private Const SW_SHOW = 5
Private Const SW_RESTORE = 9
Private Const SW_SHOWMAXIMIZED = 3
Private Const SW_SHOWMINIMIZED = 2
Private Const SW_SHOWMINNOACTIVE = 7
Private Const SW_SHOWNA = 8
Private Const SW_SHOWNOACTIVATE = 4
Private Const SW_SHOWNORMAL = 1
 
Private Const ERROR_BAD_FORMAT = 11&
Private Const SE_ERR_ACCESSDENIED = 5
Private Const SE_ERR_ASSOCINCOMPLETE = 27
Private Const SE_ERR_DDEBUSY = 30
Private Const SE_ERR_DDEFAIL = 29
Private Const SE_ERR_DDETIMEOUT = 28
Private Const SE_ERR_DLLNOTFOUND = 32
Private Const SE_ERR_FNF = 2
Private Const SE_ERR_NOASSOC = 31
Private Const SE_ERR_OOM = 8
Private Const SE_ERR_PNF = 3
Private Const SE_ERR_SHARE = 26
 
Private Sub Command1_Click()
 Dim Retval As Long
 
 Retval = ShellExecute(Me.hwnd, "open", "C:\Windows\Notepad.exe", _
    "C:\test.txt", "c:\", SW_SHOWNORMAL)
End Sub