What you are trying to do is to open a folder for Input instead of the selected file.
VB Code:
  1. Dim sFileName As String
  2. sFileName = File1.Path
  3. If Right$(sFileName, 1) <> "\" Then
  4.     sFileName = sFileName & "\"
  5. End If
  6. sFileName = sFileName & File1.FileName
  7. Open sFileName For Input As #1
  8.     txtWriteTab.Text = Input(LOF(1), 1)
  9. Close #1