The new Attachment field (data type) isn't using OLE. This is a new format for 2007. An earlier version won't recognize it.
The functionality is similar though, but there are differences. For instance, you can store multiple files in the same attachment field. The Attachment dialog box makes working with these files easy. In addition, you can move the database or the attached files without breaking anything. Perhaps most importantly, the stored files are small -- OLE objects were huge.
You can read more about the new attachment field in the Help files -- just search on "Attachment Field."
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