Microsoft Office Online Server
Microsoft on-premises server product that runs Office Online. Previously known as Office Web Apps Server.
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the file created in 2000 and the file name extension is *.mdb in older version of office 2K, not able to open in Microsoft Access 365
See this article: https://learn.microsoft.com/en-us/office/troubleshoot/access/database-previous-version
You need Access 2003 to convret the file format.