How to protect Excel file with password in VB6

'==============================================================================
' Tutorial 27
'
' This tutorial shows how to create an Excel file in VB6 and
' encrypt the Excel file by setting the password required for opening the file.
'==============================================================================

VERSION 5.00
Begin VB.Form Form1 
    Caption         =   "Form1"
    ClientHeight    =   4590
    ClientLeft      =   60
    ClientTop       =   345
    ClientWidth     =   6885
    LinkTopic       =   "Form1"
    ScaleHeight     =   4590
    ScaleWidth      =   6885
    StartUpPosition =   3
    Begin VB.Label Label1 
        AutoSize        =   -1
        Height          =   100
        Left            =   120
        TabIndex        =   0
        Top             =   120
        Width           =   100
    End
End

Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False

Private Sub Form_Load()

    Me.Label1.Caption = "Tutorial 27" & vbCrLf & "---------------" & vbCrLf

    ' Create an instance of the class that exports Excel files
    Set workbook = CreateObject("EasyXLS.ExcelDocument")

    ' Create two worksheets
    workbook.easy_addWorksheet_2 ("First tab")
    workbook.easy_addWorksheet_2 ("Second tab")

    ' Set the password for protecting the Excel file when the file is open
    workbook.easy_getOptions().setPasswordToOpen ("password")

    ' Export Excel file
    Me.Label1.Caption = Me.Label1.Caption & vbCrLf & _
                           "Writing file C:\Samples\Tutorial27 - protect Excel with password and encryption.xlsx"
    workbook.easy_WriteXLSXFile ("C:\Samples\Tutorial27 - protect Excel with password and encryption.xlsx")

    ' Confirm export of Excel file
    If workbook.easy_getError() = "" Then
        Me.Label1.Caption = Me.Label1.Caption & vbCrLf & "File successfully created."
    Else
        Me.Label1.Caption = Me.Label1.Caption & vbCrLf & "Error: " & workbook.easy_getError()
    End If

    ' Dispose memory
    workbook.Dispose
End Sub