VB 用 Shell " explorer " 打开.dat 结尾的文件，总是无效的过程调用或函数， 问题在哪

标准模块：
Type pinfo
name As String * 4
age As Integer
addr As String * 10
End Type

窗体模块
Option Base 1（声明）
Private Sub Form_Click()
Static a() As pinfo
Open App.Path & "\p_list.dat" For Append As #1
n = InputBox("请问你要输入几个人的信息？")
ReDim a(n) As pinfo
For i = 1 To n
  a(i).name = InputBox("请输入姓名")
  a(i).age = InputBox("请输入年龄")
  a(i).addr = InputBox("请输入所在地区")
  Write #1, a(i).name, a(i).age, a(i).addr

Next
Close #1
  b = MsgBox("文件写入完毕是否查看该文件？", vbYesNo + vbQuestion)
If b = vbYes Then
  Shell " explore " & App.Path & "\p_list.dat"
End If
End Sub