Shell 是用来执行外部的可执行文件
如果是一个文件，那要用ShellExecute来启动预设的程式来开启文件
'HINSTANCE ShellExecute(
' HWND     hwnd,         // handle to parent window
' LPCTSTR  lpOperation,  // pointer to string that specifies operation to perform
' LPCTSTR  lpFile,       // pointer to filename string
' LPTSTR   lpParameters, // pointer to string that specifies executable-file parameters
' LPCTSTR  lpDirectory,  // pointer to string that specifies default directory
' INT      nShowCmd      // whether file is shown when opened
'   );

例：.doc 是由word或wordpad来开启
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

Const SW_SHOW = 5

ret = ShellExecute(me.hWnd, "open" , "文件完整路径及名称","", "", SW_SHOW