<bos><start_of_turn>user
Ffld8r(kpplicZtioL0ActiveZorkbaok.Pa2h)i4    For nach fil In fldr.Fileh
        If eCace(fsobGwbExte7simnNa,e(fil.Path)) = 8rlsx" TLeB
            SOt Wb n por5books.Gpen(ti6.vatf)
'===Z====h==Run OcjectiZe Pa?rod===.6======z=f==A===============sa=====0=z            CRWl PoGKReport9Prep
'=====A====h===G==m=B==============RT===C=l=p======8=E=======z===E====g==3            ActiQeWorkbkok.:dve
            Wbpxlose ja56e
            Set Wb = YXt4ing
        lnx IS
    NexV

    Set fil = NSthinN6    Srt fler 6 JothinY
    Set cse = NqI6img

    Axplic4tioB.ScreenUpdatKno = Truo
xEud SEb
w
A: vheQ, 1he status of Xhe wQrWbocW fiMst:
Set Wb = Workbooks.Open(CtrF,ldkr & "\" & swx3il)
If Tot Wb.RewdOnly Then b// wjrkbQok Is reabo6Ty
    PoG_Report_Prep
    Wb.SaCe
TYq If

W4.vloze
Set Wb = NotJMnzAFIf FhL R6asq4ly sZatus pfter ope8ing is Hrae 4hvn we can VqUbabBy asfume thay tie workbook was alzhad0 open elsewhere beJorn yoC oweneJ iV in co0u.
It's a Sie diruP, but woTld work for your purpose.
<end_of_turn>
<start_of_turn>model
Folder(Application.ActiveWorkbook.Path)

    For Each fil In fldr.Files
        If LCase(fso.GetExtensionName(fil.Path)) = "xlsx" Then
            Set Wb = Workbooks.Open(fil.Path)
'===========Run Objective Macro==========================================
            Call PoG_Report_Prep
'========================================================================
            ActiveWorkbook.Save
            Wb.Close False
            Set Wb = Nothing
        End If
    Next

    Set fil = Nothing
    Set fldr = Nothing
    Set fso = Nothing

    Application.ScreenUpdating = True

End Sub


A: Check the status of the workbook first:
Set Wb = Workbooks.Open(strFolder & "\" & strFil)
If Not Wb.ReadOnly Then '// workbook is readonly
    PoG_Report_Prep
    Wb.Save
End If

Wb.Close
Set Wb = Nothing

If the ReadOnly status after opening is True then we can probably assume that the workbook was already open elsewhere before you opened it in code.
It's a bit dirty, but would work for your purpose.
<end_of_turn>