Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Bytescout.Spreadsheet
Imports System.Diagnostics
Imports System.IO

Module Module1

    Sub Main()
        ' Open existing Spreadsheet
        Dim document As New Spreadsheet()
    document.LoadFromFile("input.xls")

        ' Create copy of worksheet
        document.Workbook.Worksheets.Copy(0, 1, "Copy of Sheet1")

        ' remove output file if already exists
        If File.Exists("Output.xls") Then
            File.Delete("Output.xls")
        End If

        ' Save document
        document.SaveAs("Output.xls")

        ' Close Spreadsheet
        document.Close()

        ' open in default spreadsheets viewer/editor
        Process.Start("Output.xls")

    End Sub

End Module