OLE support is on Windows only. This warning is displayed when opening a worksheet on a Macintosh or UNIX machine containing OLE* objects. The OLE content will not appear.
Also, both Classic and Standard worksheet interfaces on Windows can contain OLE objects and embedded Metafiles.
When opening a Classic worksheet that contains an OLE object in the Standard interface in Windows, this warning dialog is displayed, as the content may not appear, despite that both interfaces can contain OLE objects.
* Object linking and embedding compound document standard developed by Microsoft® Corporation.