ShowSaveFileDialogue: Purpose of filter?

ShowSaveFileDialog (filter As String, defaultName As String) As FolderItem

What is the purpose in a Save File Dialogue of having a filter? What does it do? Say your filter is one that is only text files.

Here is the example in the documentation:

Var f As FolderItem
Var fileStream As TextOutputStream
f = FolderItem.ShowSaveFileDialog(FileTypeGroup1.Text.Extensions, "MyInfo.txt")
If f <> Nil Then
  fileStream = TextOutputStream.Create(f)
  fileStream.WriteLine(NameField.Text)
  fileStream.WriteLine(AddressField.Text)
  fileStream.WriteLine(PhoneField.Text)
  fileStream.Close
End If

It seems to me that the below behaves identically

Var f As FolderItem
Var fileStream As TextOutputStream
f = FolderItem.ShowSaveFileDialog("", "MyInfo.txt")
If f <> Nil Then
  fileStream = TextOutputStream.Create(f)
  fileStream.WriteLine(NameField.Text)
  fileStream.WriteLine(AddressField.Text)
  fileStream.WriteLine(PhoneField.Text)
  fileStream.Close
End If

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