このマクロを走らせちゃってください。
(フォルダの場所だけ書き換えて)
Sub RemoveReadOnlyRecommended()
Dim folder As String
Dim f As String
Dim wb As Workbook
Dim fullPath As String
folder = \u0026quot;C:\\path\\to\\folder\\\u0026quot; ' ← ここだけ書き換え
Application.DisplayAlerts = False
f = Dir(folder \u0026amp; \u0026quot;*.xls*\u0026quot;)
Do While f \u0026lt;\u0026gt; \u0026quot;\u0026quot;
fullPath = folder \u0026amp; f
SetAttr fullPath, vbNormal
Set wb = Workbooks.Open( _
Filename:=fullPath, _
ReadOnly:=False, _
IgnoreReadOnlyRecommended:=True)
wb.ReadOnlyRecommended = False
wb.Save
wb.Close SaveChanges:=False
f = Dir()
Loop
Application.DisplayAlerts = True
End Sub