Option Compare Database
    Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" _
     (ByVal hwnd As Long, ByVal lpszOp As String, _
     ByVal lpszFile As String, ByVal lpszParams As String, _
     ByVal LpszDir As String, ByVal FsShowCmd As Long) _
     As Long
    Const SW_SHOW = 1
     
Private Sub Enter_Click()
ShellExecute 0, "Open", "c:\aa.doc", "", "", SW_SHOW
End Sub

用它来解决一切已关联的文件open问题.