Private Sub UniqueFileLinesSample()
    Const strFn = "UniqueFileLinesSample"

    Dim strInFile As String
    strInFile = CombinePathAndFile(GetWindowsDirectory, "WIN.INI")
    strInFile = InputBox("Input file: ({Esc} cancels.)", strFn, strInFile)
    If Len(strInFile) = 0 Then Exit Sub

    Dim strOutFile As String
    strOutFile = GetTempFileName(Null, strFn)
    strOutFile = InputBox("Output file: (FILE WILL BE OVERWRITTEN; {Esc} cancels.)", strFn, strOutFile)
    If Len(strOutFile) = 0 Then Exit Sub

    Dim enumCompare As VbCompareMethod
    Select Case MsgBox("Use dictionary/text comparisons?  Choose No for literal/binary.", vbQuestion + vbYesNoCancel + vbDefaultButton1, strFn)
        Case vbYes
            enumCompare = vbTextCompare
        Case vbNo
            intCompare = vbBinaryCompare
        Case vbCancel
            Exit Sub
        Case Else
            Stop
    End Select

    MsgBox "Return = " & UniqueFileLines(strInFile, strOutFile, intCompare) & " (True means success; False means failure.)", vbInformation, strFn
End Sub