Refer to a workbook that is closed - excel

Question

Problem:
I am working on the "Extract" workbook and expect to copy some data from the "Sales2021" workbook which is closed. The point is: when I have 2 workbooks open, the code works perfectly but when I close "Sales2021", it runs into error. My purpose is to modify the script so that even when "Sales2021" is closed, it still works.
Code explanations:
"Extract" contains 2 sheets, sheet1 and sheet2 (sheet2 is the destination sheet where I want to copy data from "Sales2021" to). "Sales2021" has only "Master_data" sheet. I want to check whether cells (1,2) and (1,3) of sheet1 match data in column 2 and 3 of "Master_data".
Sub Extract()
Dim LastRow As Long
Dim i As Long, j As Long
'Find the last used row in Column A
With Workbooks("Sales2021.xlsm").Sheets("Master_data")
LastRow = .Cells(.Rows.Count, "A").End(xlUp).Row
End With
'Copy headers
Worksheets("Extract").Rows(1).Value = Workbooks("Sales2021.xlsm").Sheets("Master_data").Rows(1).Value
'first row number'
With Worksheets("Sheet2")
j = .Cells(.Rows.Count, "A").End(xlUp).Row + 1
End With
For i = 1 To LastRow
With Workbooks("Sales2021.xlsm").Sheets("Master_data")
If (.Cells(i, 2).Value = Worksheets("Sheet1").Cells(1, 1).Value And .Cells(i, 3).Value = Worksheets("Sheet1").Cells(1, 2).Value) Or (.Cells(i, 2).Value = Worksheets("Sheet1").Cells(1, 1).Value And Worksheets("Sheet1").Cells(1, 2).Value = "") Then
.Rows(i).Copy Destination:=Worksheets("Sheet2").Range("A" & j)
j = j + 1
End If
End With
Next i
End Sub

Answer 1

I haven't really tested this. The code checks if the workbooks is already open and opens it if needed.
Public Sub Extract()
Const EXPECTED_PATH As String = "C:\Users\Laura\Test\Sales2021.xlsm.xlsx"
'Check if the file is already open, if it isn't then open it.
Dim ReportBk As Workbook
Dim wrkBk As Workbook
For Each wrkBk In Application.Workbooks
If wrkBk.FullName = EXPECTED_PATH Then
Set ReportBk = wrkBk
Exit For
End If
Next wrkBk
If wrkBk Is Nothing Then
Set ReportBk = Workbooks.Open(EXPECTED_PATH)
End If
Dim Source_LastRow As Long
With ReportBk.Worksheets("Master_data")
Source_LastRow = .Cells(.Rows.Count, 1).End(xlUp).Row
ThisWorkbook.Worksheets("Extract").Rows(1).Value = .Rows(1).Value
End With
Dim Target_LastRow As Long
With ThisWorkbook.Worksheets("Sheet2")
Target_LastRow = .Cells(.Rows.Count, 1).End(xlUp).Row + 1
End With
With ReportBk.Worksheets("Master_data")
Dim i As Long
For i = 1 To Source_LastRow
If (.Cells(i, 2).Value = Worksheets("Sheet1").Cells(1, 1).Value And _
.Cells(i, 3).Value = Worksheets("Sheet1").Cells(1, 2).Value) Or _
(.Cells(i, 2).Value = Worksheets("Sheet1").Cells(1, 1).Value And _
Worksheets("Sheet1").Cells(1, 2).Value = "") Then
.Rows(i).Copy Destination:=Worksheets("Sheet2").Cells(Target_LastRow, 1)
Target_LastRow = Target_LastRow + 1
End If
Next i
End With
End Sub