多窗口的选择,这个程序不行?

[muxi02]

Private Sub Command1_Click()
Unload Me
End Sub

Private Sub mnuexit_Click()
Unload Me
End Sub

Private Sub mnuopen_Click()
Dim i As Integer
Dim y As Integer
Dim z As Integer
Dim filenames$()
CommonDialog1.FileName = ""
CommonDialog1.Filter = "all files|*.*"
CommonDialog1.Flags = cdlofnallownultiselect
CommonDialog1.Action = 1
CommonDialog1.FileName = CommonDialog1.FileName & Chr(32)
z = 1
For i = 1 To Len(CommonDialog1.FileName)
i = InStr(z, CommonDialog1.FileName, Chr(32))
If i = 0 Then Exit Sub
ReDim Preserve filenames(y)
filenames(y) = Mid(CommonDialog1.FileName, z, i - z)
z = i + 1
y = y + 1
Next
List1.Clear
If y = 1 Then
List1.AddItem filenames(0)
Else
For i = 1 To y - 1
List1.AddItem filenames(0) & "\" & filenames(i)
Next
End If

End Sub