Open Workbook on new instance

Question

Would my code, which I'm currently working on, open workbooks in a new instance? How can I tell whether the workbook is opening in a new instance if it is opening the workbook?

Sub AQUAS()
 Dim bookPath As String, bookWb As Workbook
 bookPath = "\\C:\FLUXO CAIXA HINDY - 118.xlsm"
 Dim Resultado As VbMsgBoxResult
 Dim NewExcel As Object
 Set NewExcel = New Excel.Application
 
 With NewExcel
 
 If Dir(bookPath) = "" Then MsgBox "Planilha não encontrada": Exit Sub
 
 If IsWorkBookOpen(bookPath) Then
        Resultado = MsgBox("Arquivo em Uso, Abrir somente leitura?", vbYesNo + vbInformation, "AQUAS")
        If Resultado = vbYes Then
            Workbooks.Open (bookPath), True, True
            Application.WindowState = xlMaximized
        Else
            Exit Sub
        End If
 Else
        Workbooks.Open (bookPath), True
        Application.WindowState = xlMaximized
 End If
 
 End With
 
End Sub

Answer 1

It must function.

You aren't opening the Workbook in the newly generated instance, though. The With-clause instructs VBA to utilise the object for all members that are preceded by a dot, in your case the new Excel Instance. Thus, to access the Workbook in the just-created instance, use

With NewExcel
    If Dir(bookPath) = "" Then 
        MsgBox "Planilha não encontrada"
        Exit Sub
    End If

    If IsWorkBookOpen(bookPath) Then
        Resultado = MsgBox("Arquivo em Uso, Abrir somente leitura?", vbYesNo + vbInformation, "AQUAS")
        If Resultado <> vbYes Then Exit Sub
      
       .Workbooks.Open bookPath, True, True
    Else
       .Workbooks.Open bookPath, True
    End If
    .Application.WindowState = xlMaximized
 End With

Be careful, your code will not be able to close that Excel instance.