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open xls workbook, check if already open

In MS Access I want to first check to see if Excel is open.  If so, check to see if a certain workbook is already open.  If not open it, otherwise set the open workbook as the active workbook.

Here is what I have so far.  Almost there but if it is already open it gives a warning about re-opening an open workbook.

Private Function UpdateCrisisChart()
Dim xls As Object
Dim wrk As Object
Dim Sheet As Object
Dim strExcelFile As String
        
    If IsExcelRunning Then
        Set xls = GetObject(, "Excel.Application")
    Else
        Set xls = CreateObject("Excel.Application")
    End If
    
    xls.Visible = True
    
    strExcelFile = GetExcelFilename(Me.SDate, "Adult")
    Set wrk = xls.Workbooks.Open(strExcelFile)
        
End Function

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Rey Obrero (Capricorn1)
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ASKER

Sounds good.  So on error trap, what do I use instead of .Open in:  
          Set wrk = xls.Workbooks.Open(strExcelFile)
I should mention I am concerned if they have multiple workbooks open,  one of which is the one I need.  How do I set the one I want as active?
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As an aside, I'm using "Early Binding" in my code, declaring the excel objects like this:

Dim xlApp As Excel.Application
Dim xlWB As Excel.Workbook
Dim xlWS As Excel.Worksheet
Dim wb As Excel.Workbook

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This makes for easy programming, because you get auto completion of your commands in the VB Editor,

However, if compatibility across multiple versions of Office is a concern, use late binding instead - declaring these as generic Objects:

Dim xlApp As Object
Dim xlWB As Object
Dim xlWS As Object
Dim wb As Object

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The downside to Late Binding is that you lose the intellisense/autocompletion in programming, and possibly take a slight performance hit.

I typically keep both versions in my code and switch between them - commenting out the late binding in favor of early binding to get auto completion, and then switching back to late binding before deploying an application so that it will work regardless of Office version.